1. RPGs of all types (not if there more hack-n-slash actiony than a actual rpg though)
2. Action Adventures (3rd person story driven games) (prefer if they arn't too heavy on the action, its the exploration and story that grabs you)
3. Platforming 2D/3D (not the castlevainia/2D metroid/Meat boy type clones)
4. Tactics games.
2-3-4 are almost all interchangeable.
I enjoy a occasional sim or strategy/puzzle game too, hell even a good shooter (say Half-life single player, or doom).... There's not really any bad genre, just bad games.
Call of duty, online shooters just never appealed to me, and I dont understand why they are as big as they are.
Sports games, why would you buy a sports game? go play it yourself instead.
Fighting games, I used to enjoy fighters when I was younger but... not these days. Basically if its not street fighter, im not even touching it.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071