The second best RPG of all time.
I'm just posting this to bump the score. I wouldn't have to do it if Grumbel's review wasn't so tedious and frustrating. If you're wondering whether to play Planescape there are hundreds of professional reviews and lists citing it as one of the greatest RPGs and it's hailed as a game with one of the best stories ever told in video games.
The spiritual successor to Planescape - Tides of Numeria managed to raise 4.2 million dollars in 30 days on kickstarter. That I think speaks louder than any one man's opinion.
And yes, I'm well aware of how juvenile and stupid this is. Screw Grumbel's review.