My review, with minimum spoilers:
Music: The pieces in and of themselves were good (some really good. One in particular played only 5 times), but very few. Which meant that we heard the same music over and over again for 95 episodes. It can get on your nerves, especially the sad music repeated ad nauseam. More diversity in soundtrack would have been great.
Acting: Overall, I found it great. Some awkward and unnatural moments here and there (when they laugh especially...), but it doesn't detract from its general goodness. The main characters are all acted well. There is no doubt in my mind that the best actor was Chen Jianbin who portrayed Cao Cao. His perfomance instantly captivated me to the show and to the character. And I saw in interviews that he fought to play the role of Cao Cao and refused to play anything else, and it shows in the show for the amount of passion he puts into it.
Costumes: I find them good overall and they seem historically accurate and appropriate for the era though I am not qualified enough to say so with certainty. But some of the beards were blatantly fake, like Cao Cao's black beard (it looks more real when he gets old). I like how soldiers and officers of each Kingdom look differently with different armor, even though they probably weren't that different historically. There is one helmet that I find odd and it likely didn't exist, but for the most part costume design was more than adequate.
Passage of time: For a show that spans decades, it is essential that we can identify and feel the passage of time which is a tricky thing to do. Aging was done well for the likes of Cao Cao and Liu Bei, but done poorly with other characters (most blatant example is Guan Yu). Also, the show suffers from the absence of dates. Since I studied the period previously, I have an idea of what time such and such event happened, but even I got lost during the show. Some characters do give us an idea how much time passed, but it's not present enough. It would have been better if we had the date shown with every event.
Warfare: Since the period is about constant warfare, then this part is important even if it is not ultimately the most important thing. The show afterall is focused more on human drama than historical accuracy when it comes to military campaigns and battles. Even so, I felt the show did them pretty well in general. The strategies employed and the strategic thinking of characters are thoroughly explained (sometimes twice or thrice), make sense and are more or less accurate (barring a number of exceptions). However the strategic element suffers from the lack of a map. Like with dates, the show assumes that you know the geography of China (since it's aimed at a Chinese audience, perhaps it is not unfair). Several times I had to look at a map to grasp the geo-political situation and why such and such strategy was employed. It would have been better if we had a map sequence shoing us troop movements and the like.
When it comes to battles and tactics, which is harder to pull off than strategies, it's more problematic. Some formations are shown that most likely never existed (and with such limited utility). Sometimes it's even stupid (Cao Cao was uncharacteristically stupid in the preude to the battle of Chi Bi. Unlit arrows are not going to destroy ships, but that was done to over-glorify Zhuge Liang). The Battle of Guan Du was one of the few battles that portrayed the tactical element well (even if it was historically innacurate). But overall, it's done well enough for the purposes of the show.
When it comes to action, it is also done well but is sometimes over the top, especially in scenes involving Zhao Yun (the only scenes that ****** me off). But in general, while over-glorified, the action is realistic enough to not boggle your mind.
Story: Now to the most important part, the story. Here is where the show excells. The period of the Three Kingdoms is not one that can be portrayed easily, even with 95 episodes. It's a period full of intrigue, great figures and a lot of drama. And the show pulls it off extremily well, problems notwithstanding.
The show has its biases, being based on the novel The Romance of the Three Kingdoms which was biased. It is biased towards Liu Bei, Zhuge Liang and the Shu-Han Kingdom in general (who are the most popular according to the polls I've seen). But despite the bias, it tries and succeeds in bringing a lot of nuance in the show, never falling into the trap of villanizing anyone (barring Dong Zhuo of course). All characters (barring very few) and sides are complex, multi-faceted, understandable and even sympathetic, while being of course flawed. In other words, pretty human. Cao Cao in particular was done very well. In the past, he was always portrayed as the villain of the period. But the show re-interprets Cao Cao as a ruthless but great visionary, who was fair to his men and by all accounts a great leader overall. Sima Yi too was portrayed pretty well, despite the tendency to see him as a villain. On the otherhand Zhuge Liang, who in general is portrayed as almost a divine being, is shown as a melancholic and lonely man in his old age who is obsessed with invading Wei. There is only one character that I find was poorly done and that's Cao Zhen, who was ridiculous, hilariously pathetic and idiotic all at once, which is historically innacurate. In general however, the show's myriad of character forms its essence and they are portrayed brilliantly.
The pacing is well done overall, except when it comes to the last dozen of episodes or so, which is understandable. 10 or so additional episodes would have helped a lot. By the end, the show becomes too focused on the conflict between Shu and Wei, with Zhuge Liang's Northern Expeditions, that we no longer see the Kingdom of Wu and know extremily little of what is happening with them. But in general, the show was always more focused on the rivalry between Wei and Shu, with Wu occasionally coming in to tip the scale (the exception being the war between Shu and Wu). This is dissapointing to a certain extent, especially since the battle of He Fei was never shown only mentionned (but I am a Wei fan and like to see battles where Wei wins brilliantly). But despite this, the tripartite balance of power and state of affairs of the period is shown and explained pretty well.
There are minor issues here and there, like Xiahou Dun only appearing once or not enough Zhang Liao. The bias towards Zhuge Liand in his rivalry with Zhou Yu and Sima Yi (who was historically never saved by rain), especially the former, can get annoying at times.
But overall, the story is superb. It captures the political intrigue, constant warfare, heroism, emotion and drama of the period brilliantly. It's a must watch.