The level design was pretty great, you would always feel like you were discovering the right path yourself and not being guided along like so many corridor shooters. The game design creatively shows you how to deal with various situations without spelling it out on your screen. Basically, the whole thing feels like an adventure.
Are there any PC games with a competitive ranking/matchmaking system like Halo 2(xbox version) and Starcraft 2 have? Where you can lose levels for losing games? I can't seem to find any games with a competitive multiplayer like this anymore.