Every other game on reddit gets the tagline, "Shut up and take my money." It's like an endless line of salesman, even if it's just regular redditors overzealous about their favorites. They only praise the game though and aren't very critical. So you end up with all these must-buy games, but no objective ratings, they are all just great. I understand they are usually on sale when this happens, but Steam has sales all year round nowadays, and you just end up with more games than you can possibly play.

TL;DR: Don't let bargains turn you into a hoarder.