Now, I'm not sure how unpopular these are, so my apologies if I'm wrong and they're actually popular opinions. XD
1. I thought the first half of Final Fantasy XIII, where you were running down hallways and watching cutscenes, was better than the second half, where it opened up.
2. I think both Mass Effect games are amazing and are my personal favorite Bioware games.
3. I prefer KOTOR 2 to KOTOR 1, despite KOTOR 2's flaws (Obsidian can make games!).
4. I thought Dragon Age 2 was actually pretty good and enjoyable (though I prefer Origins).
5. I thought Origins was essentially the "ultimate" Bioware game.
6. Er... This may not be unpopular, but I don't think Valve has ever made a bad game that I've played.
7. This probably is unpopular, but I don't think Bioware has ever made a bad game that I've played. (And that's everything from KOTOR on, excluding that Sonic RPG.)
8. I think Halo is awesome and am excited for Halo 4.
9. The only Duke Nukem game I played was the first one, and so I always relate the character to that, not Duke Nukem 3D.
10. I think Madden games (and sports game in general) are a lot of fun.
11. I think Modern Warfare 2 was a great Call of Duty game that in several ways surpassed the first MW, and I think the multiplayer was better (but, granted, I didn't play as much Modern Warfare 1 multiplayer).
12. I actually enjoy the plot of the Halo games, despite its simplicity.
13. I thought Black Ops had a pretty darn good plot for being the game it was.
14. I think Bioware still has good writing, even after Dragon Age 2.
15. I think Star Wars: The Old Republic is going to be awesome (and the same for Mass Effect 3).
16. I found Phantom Hourglass to be the most enjoyable handheld Zelda game I've played, and my personal favorite. And I played Link to the Past. On my GBA. Yeah, I like Phantom Hourglass more than that. Also, Twilight Princess is my favorite Zelda game (is that unpopular, though? I've heard it isn't).
17. I think I have too many points. Wait, that might be a popular opinion. My bad.