I usually pick games based on the art style first, then check the reviews and ratings. If the score is too low, I hesitate, there's almost always a good reason for it. I once jumped into a poorly rated game just because I loved the art, and I deeply regretted it.
The theme is equally important, and the art usually hints at the overall tone. For example, a darker game will lean into a specific, moody color palette. Personally, I can't stand toxic melodrama or NTR, so if I spot any of those elements, I stay far away.
That said, if a game's art isn't quite my style but its ratings are through the roof, I'll still give it a shot, knowing I'm strictly playing it for the plot.