Ah, well that makes sense. I think for this person it was a matter of a few simple things from what I gather. Gameplay being easier than others. A challenge was wanted and people confirmed it wasn't really that hard though they did try to make it hard by screwing with tactics, potions, abilities, etc which actually failed to make it harder and seemed to just make it less fun. Also I think the lack of immersion and drive to finish the story along with some of the tedious work involved was off putting. This is something a large group has felt about this game. Even I can think back to DA2 and as much as I hated it I was pretty immersed in the story and my Hawke. Moreso than this one. I didn't not care about any of it in that game. I was simply frustrated with some of what was too stupid for words (like the whole escalation of the mage/templar thing which everyone saw coming but you had to sit and watch and wait for it to implode - utterly insane! or never-ending enemies literally dropping from the sky!) Now those things seem more like nuisance things compared to this story which is nearly impossible for me to really care about my character or what happens though I have tried many times and still keep trying (which is pretty sad or pathetic I guess LOL).
I think these sorts of things are things our friend here wanted in a game and when enough people said it's not there that was simply enough. Not everyone feels this way but if you are selective about getting a game and you come across this stuff, you will likely wait or just not buy. I probably would have waited like I did with skyrim which I absolutely adored.
As for matter of opinion on immersion seeming off - if enough people say it then it is worth paying attention to because that is something you never really hear about RPG games. But when you hear it then it is something to consider and put into context - why did that person not feel immersed? Usually it's worth holding off on to see if you can pinpoint the why. I would never buy a game people said they couldn't immerse themselves in. I would wait and dig deeper.
Very well said, count me in for those people who just could not immerse themselves into the story, the rest didnt bother me, game mechanics, tactical cam issues, or bugs, never bothered me. I loved DAO and even though DA2 was weaker and I never much felt the need to replay it it was still good to play through once for me, the entire ME series is brilliant in my opinion I was even in the minority there who were actually ok with the original ending, not that the extended cut didnt improve on it, it did, but I still just absolutely loved the game anyway.
With DAI, I actually felt the first time with modern bioware games that I cant find my place in, my favorite type of game is the extremely story driven one (you can call it mostly linear, but not necessarily, depends on how the story was written), almost to the extent of an interactive movie, and in that respect I was sort of disappointed with the game. I like the story quests, but the moment they ended all I could think of was that I have to go back and grind more power to be able to continue, and yes, you cannot completely ignore the sidequests unfortunatelly like many people say you can, to grind 40 power out for the last story quest I spent like 3 hours grinding when all I wanted to do is face the big baddie, but had to settle with planting banners 
Here's a suggestion: bioware, make a patch that removes power requirements from story quests (or just set the required amount to 0), so you can always continue the story if you want to.
Other things have more to do with writing, and storytelling. Let me name another game where story was interrupted by grindy bits, but it was done well, it is a classic: Freelancer. I loved it, and I mean I played 13 hours non stop from start to finish it. It was a sort of open world (or space) game and the writing complemented that.
There were story missions, when they ended they always ended with a bit more information, something you didnt know before, but always ended with you not knowing what to do next, that's when your partner went to investigate the next clue, while you were left to basically grind money or whatever, when you had enough you were contacted by your partner and she said she had found the next clue, the story went on. That didnt break immersion for me because It was perceived as "we are trying to figure out our next move", while in DAI, I know about the red templars and the demon army they are trying to raise, I can see it on the map, I know it is important for the story, and all I can see is that I cant click on it because I dont have enough power.
These are the things that break immersion in the story and ultimately in the game for me. the knowledge that I know exactly what I want to do and what I would do, but I am blocked by something...