"nothing about it really stands out as must have to me"
The AI director is probably the biggest unique selling point.
"the developer is actually Turtle Rock"
Or as they're now known, Valve South ;)
The game has varying levels of difficulty which control ammo count, the number of hits a zombie can take, the number of hits you can take etc.
I can't find it now, but I've read a fair few times from people who've played the game when they played those various sections it was a lot harder...
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