I ranted about this recently in the "Games you are currently playing" thread, but the Assassin's Creed series is really overrated, IMO. It's more like a series of interactive movies than games. So much focus is put on cinematics that the gameplay (what there is of it) is really shallow, basically just amounting to going where you're told and doing what you're told while the game helps you do it. They require very little brainpower, but, unlike a good popcorn movie (which each game in the series seems to try to be) that you can turn your brain off and enjoy, if you're not using your brain while playing, it's not much of a
game, IMO.
"Aliens: Colonial Marines" is a criminally underrated game that I really enjoyed and still play on occasion.
I'm about to play it for the first time. I expect to find it not as bad as advertised, though that's mainly because I'll be playing the fully patched game. Also, I just fully played through Aliens vs Predator Classic 2000, which is a 17-year-old game, so even an Aliens game that had subpar graphics for 2013 is going to look amazing to me.
Do you play with the ACM Overhaul mod? I'll probably start the game without it, just so that I have an idea of the vanilla experience (especially the vanilla AI), and then add it and compare.
The best "Call Of Duty" game was the original for the PC.
I don't think that that's unpopular in the PC world. I think that most PC gamers would list the original as the best, with Call of Duty 2 next. They may not have technically been any better than the later entries, but that was when the series was fresh and before Activision flipped PC gamers the bird by making CoD3 console exclusive.