timppu: I hope this answer is about the same as the last time I answered this in the GOG forum.
1.
Beat'em ups, especially the 2D ones like the Street Fighter and Mortal Kombat series, mainly because I suck at them and don't feel the need to try to become better in them either. It mostly seems I need to memorize lots of different key combinations and stick moves, and which moves to do against which moves. I really tried to like the SF2Turbo something I bought for PC a long time ago, but I just couldn't get into the fake looking moves for which you need to press a couple of buttons while you swivel the pad 720 degrees.
Some games in the genre I have enjoyed somewhat though: Karate Champ coin op, Yie Ar Kung Fu coin op, Virtua Fighter 2 coin op. The first two have quite simple controls that even I can memorize easily, Yie Ar was mostly about timing and trying to avoid enemies with constant jumping, not about learning lots of moves and controls.
I'm sometimes unsure whether these games are even meant to be played against the computer AI, or if they are supposed to be fun only against human players. But even the latter has failed to raise my interest.
2. Most arcade racing games. But this is a tricky genre, because I recall enjoying many driving games, some even a lot (like 4D Sports Driving, and Fatal Racing). I can't really put my finger on it why some racing games feel exciting, why the rest 95% don't.
3. Sports games in general. Speedball 2 was an exception.
4. Business simulations. Seem too much like real work. If I wanted to run a successful restaurant, I would do it for real and make some money out of it. Fortunately I don't need to. I bet there must be some business simulation about running a grocery store, making inventories, remembering to order just enough of new stuff, check the schedules which days different people come to work and shuffle them when someone calls sick, etc... Too close to what I was doing for money when I worked in a grocery store as a student.
Mortal Kombat and Street Figther are Fighting Games, Beat Em' Ups are games like Battletoads and Golden Axe.