Lack of story. When a creator just putters about with thrme story, with it getting no where update after update. It makes a game super bland.
I also dislike sudden shifts in the characters attitudes or way of thinking, especially when it cones completely out of nowhere without explanation.
I also dislike when a dev will keep remaking the gane multiple times and completely changing things. Changes like character model, relationships and so on. As others on here have mentioned, when a dev switches to steam, their game can go through and totally change. Summer's Gone is a good example, a lot of content was removed. It wasn't a big deal, but it turned me away from the game completely.
For me personally its RPGM, bad art style (honey select, etc) and the genres I don't enjoy. Usually any of these disqualifies a game from even being looked at.
After I'm looking, if the main LI's aren't attractive enough for me or the story doesn't have situation I might enjoy, I'll pass.
Once Ive downloaded a game, the grind or repetitive nature of the game will bore me or if the dev continues to remake or has extreme slow updates Ill usually pass