As stealthy as a small to medium sized thermonuclear device going off. Really enjoyed that game, looking forward to a full replay of the whole series if . . . when Project Black Mesa is relaesed.
Well at least your not hugely anticipating Episode 3 like the rest of us seeing as you've only just played this now heh. Seriously if that Portal 2 "surprise" is Episode 3 well I think Episode 3 could easily be game of the year if its coming.