A whole bunch of interesting ideas which are unconventional for the Source Engine, stuck in a game that is frustrating beyond belief.
Walking through the dream sequence every time I spawned made me want to gouge my eyes out. The sprint meter made me want to gouge my eyes out. The huge maps which would make Hunt Down the Freeman blush made me want to gouge my eyes out. Hacking made me want to gouge my eyes out. That entire final mission made me want to gouge my fucking eyes out.