When there's actual chase or flirting involved. Not simply going for sex after two minutes. Good banter is always fun. When they actually try to hide their relationship with other LI. As people mentioned it before, real bro's in the game, them getting their own happy ending.
Can't remember any game that comes to mind that has a good collectibles. Not really a fan, if it's something easy and gives good renders, then I might go out of my way to get them, but usually it's not the case, so I'm not really fond of it.
No specific way, I already a list of "To play" games and just follow that or if I read a good enough summary then I jump to that one which I usually find by randomly browsing or looking up a specific fetish.
Fewer love interests, more content with them and diversify it. Both in the kinks that have and body size and shape.
This is just an example, but I'd love a game with a Futa, BBW, GILF, MILF and a Teen in it. Not every single character has to look 20, athletic, clean shaved and perfect boobs.
Forced sex that we can't avoid with certain characters.
NTR
Too many love interests
Too many routes to replay
Game over's and too grindy sandboxes.
Probably a few more things that currently do not come to mind.
It's honestly hard to avoid it, but personally I think it's been over done in games and it's no longer a turn on as it used to be. Unless it's done a bit differently...
Usually I wait for 0.3 at least, I can start a game on 0.1 if there's a 1.000+ renders in the first release, but also I'll push a game to 0.5 if there's very few renders per update.
Depends, in most cases I prefer trimmed pubic hair or a regular bush on a milf. If it's more dirtier game then I expect at least some girls to go full bush. I don't mind clean shave, but I do not like it when everyone is the same in that regard.
Related to me, then it has to be Aunt, Daughter, Sister in that order. I also enjoy Mother and Daughter incest who aren't related to me, like my GF and her mom for example.