Hate:

-Real Time Timers: Think FF13 Lightning Returns. It doesn't matter how many mechanics there are to alleviate the pressure, they make me so stressed out that I don't enjoy playing the actual game.

-Unrepairable Durability Mechanics: I mean things like Breath of the Wild where you can use a weapon X times before it breaks with no way to repair it. I end up never wanting to use "my good weapon" and tryto beat entire games with a 2x4. If I can go to a vendor and repair my gear, I don't mind as much.

-Superhard Games without difficulty options. Looking at you Soulsborne games; I appreciate that some people like a challenge, but I really think that whole genre would only benefit from giving the player options. I have noticed that seems to be getting more common though.

Love:

-Meaningful Choices: Not two dialogue options with the same end result, but things that shape either story or gameplay. This could be a major branching story choice OR something like a talent tree.

-Base Building: I like build base. It doesn't have to be a city builder or strategy game (Though I absolutely love those), but I am a sucker for games including any degree of base building. It's my favourite part of the XCom games as an example. Bonus if I have to make choices about my base, see previous point.