It depends on the game. If it’s a game like Poly Bridge (just a recent example that comes to mind), I will usually listen to an audiobook or podcast while playing. That’s not to say the soundtrack is bad, it’s just not integral to the experience. And after hearing it a few times it becomes repetitive.
This reminds me, didn’t someone once say they mute the entire game (music + sounds) 
? Oh yeah, it was:
To which Gnuffi responded 
As for great game soundtracks, a few that come to mind are: Jet Set Radio/Future, FTL, anything from Supergiant games, Castlvania: Symphony of the Night, Mega Man 2, DuckTales. Though I typically don’t listen to the OST outside of the game.