In terms of blending together shooter and rpg stuff I think over time it just got better, with ME1's being the worst. It's a good first try but ME2's is better and ME3 is around the point where I'd want it to be. Still some things to work out (like better dialogue wheel, which I don't mind) or a greater reaction to our choices...but hopefully that is something that MEA will do.
The mako is fine to drive, the problem was the terrain was on the sidequest planets out of whack. I once did every single sidequest in ME1 and I painfully discovered that going out of a planet and back puts you in the same position, which in same cases meant there was no scape from 15 or 20 minutes of just trying to get out of a hole. I think people react to the mako like with the batmobile in Arkham Knight, it controls fine, you just need practice (I'm in new game x and instead of 40 mins or so I've now beaten each Riddler race almost always on my first try.)
ME3's customization in powers, mods, armor...was the best out of the series. I don't know if that one's really unpopular, but whatever.
I hate Ashley, which took all the tension out of the Virmire choice. On the other hand I love ME1 Kaidan. He's a nice guy that has dealt and can deal with his own ****. I also liked that he had had problems that were not big tragedies. Then it came the Kaidashley, also known as the VS, that one can go out the airlock.
I don't mind the ammo thing, one way or the other. I just want ME3 or better shooting mechanics. I hated snipers in ME1 because until you got high level stabilizers you aimed like a drunk. I'm not for or against it, just make the guns feel good when I shoot and aiming not be a pain, which btw, I've played shooters on consoles with autoaim before, the only one to give me problems was ME, should probably look into that. I own ME1 and 2 for both pc and xbox, so I can tell the difference.
I know storywise it's pointless because they didn't do anyhting with it but I love ME2's intro. Something about how hte whole thing is put up together just clicks with me and makes me feel pumped up to restart the game...then I get to a thing I usually love, the character creator, and the hype dies. Not that I stop liking the experience, it's just that that excitement goes when I realize that I cannot make something look good in that CC. Good thing I love femshep's default face...in ME3.
I don't feel sorry for killing the geth, at all. Maybe a bit for Legion. I know, not that unpopular, but what is it? 50%ish of BSN think it is.
Apparently liking Omega is unpopular? Man, I loved that dlc, and the fact that you go around with Aria and the femturian instead of your usual companions.
Oh, and the ME3 endings didn't ****** me off. They didn't make sense the first time and still don't, but I was just confused and resignated. I had this tiny hope they would be able to do something good with the reapers, that there was something. I got what I expected, the reapers and the cycles don't make sense apart from the reason and being the big galaxy threatening villains. Still I'd put ME2 and 3 as the best of the trilogy, which one gets number 1 depends on the day.