Even with the current thumbs up/down people get it wrong. Give it a thumbs up but write a scathing review.

I've done that and it's a result of not having more options than good/bad. Always the same cause: I really wanted to write a 3* review for a game that has a lot to praise but its core is fundamentally flawed, but Steam doesn't let me give a 3*, so I try to correct for the review score bracket I think the game should be in.