I'm very picky when it comes to my games (anime and now movies as well.) which often leads me to being very shady as well. But, hey, whatever. If it don't interest me I've never played it. (That's a whole genre right there lol... Music, horror, puzzle, racing, NFL... stopped playing those a long time ago. Never touched a hockey, golf, soccer game in my life.) If it has a low rating or rather, if I don't like what I read on review sites (that's not the choice of words I'm looking for) I won't bother with it. (Unless it's a guilty pleasure or something that intrigues the heck outta me.)
With that said I'm just going to list a few of my least favorites. (Out of all the games I've ever played I think I've only played one game that I thought was absolutely horrible and that was Shadow the Hedgehog.) Anyway...
Shadow the Hedgehog - I was battling the camera moreso than the enemies themselves. I don't know how many times I'd fall off the road/path due to the camera being flimsy.
Everything else is bias talk.
Super Smash Brothers Brawl - The only reason I played this game was because of peer pressure. (I'm far too sensitive.) Generally, I just don't like Mario games anymore. I find nothing exciting about them these days. (I'm probably the first to say it but, I suck when it comes to platformers which is why I don't really play them.) I'm not a party person, let alone a person who plays multiplayer games. I like playing games by my lonesome.
Tekken and Soul Calibur series - I don't know when or how it happened because I thought all the Tekken games up to Tag Tournament was great. And I had fun with the first Soul Calibur game. Everything else afterwards just felt stale and boring to me. I'm also becoming more of a 2D fighter only type as of lately. I still play Dead or Alive 4 on some occasions but I'm becoming bored of that as well.
Star Ocean 3 - Fayt, Fayt and more Fayt. Like Shinji did for Evangelion (I could also use Naruto for Naruto... heh), Fayt did it here. He killed the game for me. I cannot stand naive characters as the leading character. I gave up after 10 hours into the game so I don't remember anything else. I don't really remember the battle system all that well. I just know it was kind of confusing for me to get the hang of it.
That's about all I can think of off the top of my head.