I'll make my first post on the forums for this. Pretty much the same thing a lot of people have already said, but I feel like I should chip in as well. Hope I don't come of as entitled or as a troll or anything.
I've played ME1 four times and ME2 six. Regrettably only two of those six Shephards were females. During the gameplay of ME3 as a female adept I was contemplating starting a seventh playthrough from the first game onwards as another female, with Traynor as the intended love interest. She was a great new addition to the series, with Vega's male gazes at my femShep body making me instantly like him.
The game was great, loved every hour spent leveling my femshep. Interaction with Garrus was awesome and imo he is the best character in the Bioware games I've played. I was actually wishing I'd saved that Shep playthrough for later as a desert. The deaths of Mordin and Thane brought me to tears and it nearly happened again when I thought Grunt died. The short falling out between Shephard and Joker was fantastic. Killing Kai Leng with the renegade interrupt was more than satisfactory. The game was so enjoyable I forgave the drastically smaller amount of dialogue options after a while. In addition the music was absolutely amazing and I've been listening to the soundtrack a lot. Leaving Earth is my favourite of those.
The ending however, was terrible. The Reapers blasting me was a shock and a tad irritating loss of control, but it was acceptable. While dragging Shepard to the beam I just kept wondering what happened to Garrus and Kaidan, did the game forcibly kill two of my squadmates just like that? I planned to restart the final mission and take EDI and Javik with me for the mission had that been the case, but went on to see the ending.
Meeting TIM was great, it was a clear call back to the Saren encounter. Using the renegade interrupt to kill him was a great touch. I later played the same scene again using the paragon options, making TIM do the exact same thing as Saren had in the first game. Loved that. The following conversation between Shepard and Anderson was also a tearjerker for me, it was heartbreaking to see Shephard's mentor die. I would've accepted Shephard's death here. I had ~3500 points, which I hear is not enough for the best ending, so it was acceptable, even though adopting a krogan baby with Garrus would've been the funniest thing ever in the aftermath. Loved that turian.
The scene with the program that took on the child's form aka Godchild as it seems to be called and the choices offered came out of the blue and imo didn't with the rest of ME at all. From what I understood, all three choices would kill Shephard, even though I recall a post saying you could survive the game. From reading things here, I found out you can only survive if you choose the destroy option with enough assets. Not knowing this, I replayed the ending three times, and saw the choices led to pretty much indentical "epilogues", if you can call them that. Okay, disappointed with the ending, which I didn't understand, I expected to be presented with an epilogue showcasing the ramifications of my choices. Would the krogan start another galaxy wide war because I cured the genophage? What happened to each squad member? But there was no such thing. I was seriously depressed for a long time there, abandoning all thoughts about embarking on that 7th playthrough or even replaying ME3. I felt the time I spent playing the previous games multiple times was wasted. I really wanted to see what my choices led to, still do.
After a day, I realized I loved the game up until the ending, and decided I at least want to experience Tali's romance plot. The game was truly wonderful, even though the lack of continuation to the plot about Dark Matter causing the sun to die prematurely felt odd. I suspected the Reapers had something to do with that. I read something about it being in the leaked script, which I avoided reading. Would've appreciated an explanation/conclusion to that.
Someone here on the forums said we should discount the ending and substitute our own. I hope you won't force me to do that, Bioware. I love the Mass Effect franchise, loved DA:O and enjoyed DA2, but the ending to Shephard's trilogy was a very disappointing thing to play through.

should describe it.
If the ending was all a hallucination/indoctrination like is suspected, I hope you have an epilogue dlc planned/in production already. Kind of unfair to charge us for extra to get the real ending though, but if this shock/outrage is what you wanted us to go through... Anyway, I'll still pay for an ending DLC. Preferrably one that discounts the part from collapsing in front of Anderson onwards. A rewrite or something. I want to get a proper epilogue, like the one in DA:O.
I made a wall of text apparently. Sorry about that.
In short: loved the game, but the ending didn't make sense. Pretty much what most people here say. Just please give us a proper ending. Mass Effect deserves it. <3
PS. I thought the Commander Shephard song was supposed to be in the game?