Like many people here, I'm going to say RTS games. Absolutely love them and am always enthralled by them, but I'm so bad at them, lol. Sadly, I'm quite often the same with TBS games, I just can't get the distribution of resources down properly in those and end up researching either all the wrong things, or not much at all.
Same as many others with the RPG's as well, love RPG's but, I've never ever gotten deep into the min maxing or spreadsheets of stats. Or finding all the secrets in an RPG or exploring every nook and cranny, I'm really bad for just forcing my through the game and calling it a day once I've finished the main story (for example, only finished like, 87% of Ni No Kuni, I think, never beat any of the major weapons in FF7, or even got into breeding, or Knights of the Round, so on and so forth)
Finally my last one is most anything online, MOBA's, online shooters, things like that. I love LoL and put a lot of time into TF2 and CoD: Modern Warfare, but I've never been really good at them.
So there, those are my guilty pleasures in gaming, game genres I absolutely love, but often either have to cheat to finish, or just finish bare bones story by just muscling my way through just the main story and missing a whole bunch of stuff, or get yelled at a lot for not doing very well online.