For me it would have to be 2D platformers. I have never finished one, ever in my life. And at this point I'm not sure if I dont like them because I suck at them or If I suck at them just because I don't like them.

It must be a little bit of the latter because if I find a fighting game that is difficult to me at first, I usually don't stop until I master it. But the same doesnt happen with 2D  platformers. Every time I have to do 6 or 7 consecutive jumps and I cant get through, I just give up.

Fighting games and puzzle games.
I cannot be stuffed memorising a giant list of combos, and as for puzzle games I just cant seem to execute combos. I suck at Tetris and the like.

Beat em Ups (2D and 3D) by a mile. Just can't get my head around all the move sets.

I'm going to go with Point and Click Adventure games...they are always so obtuse @.@

god damn puzzle games.
I always go to youtube for that... I know I'm shameless

Stealth. Man, I would love to finish a MGS games since they seem so incredible, but I am absolutely awful at stealthy games. It really upsets me because I find it to be such a unique and underappreciated genre. Maybe one day. 

RTS games. I can't manage huge armies, while the game is in progress. I'll focus on a certain area. But if I build a city miles away from the main area i focus on. I'll forget about them. I'm just stuck on the mindset of the game being paused. While I'm not looking at them.

FPS's, I'm absolutely terrible.

free to play games ,because if u not pay for anything u will nevr get good staf and u gona stay in the same place forever

This.