Given the sea of review sites and blogs there are, I kind of feel like Allmusic is the stalwart that often gets overlooked. They've got the usual features, album stream premieres, and release aggregation, but it's the straightforward reviews (less opinion piece than legitimately useful blends of info, bio, and history) and connective strands between artists or albums that I get the most out of. Granted, I'm rarely looking for anything current, but as far as past decades go, I can pull up pretty much anything that I'm into at the moment and get plenty of spot-on suggestions for others in the same vein.
I do wish they had an app or mobile version of the site, but that's a minor complaint. I've always got it pulled up on my phone when at the record store because it's the simplest, most reliable way for me to blindly pick stuff and be pretty confident an itch will be scratched.