it's essentially just more doom 3. it doesn't do a whole lot to improve on the base game, but it adds some very welcomed additions. the super shotgun is, well, the super shotgun. it's powerful and is just the tiniest bit more effective at longer ranges than the normal shotgun. the grabber is an alright tool, basically just used for like two moments in the game. this gravity gun isnt going to replace your traditional weapons but if you ever run out of ammo (as if that was possible), you could use it to throw back energy balls at demons. the new heart demon artifact is broken as hell. It can be pretty fun at times, but overall i stopped myself from overusing it since i'd just be playing with a get-out-of-jail-for-free card. some areas are filled with a lot of enemies now which the base game didn't really do. now the ammo count is a bit more justified, and the overwhelming odds add some tension to the horror. glad to have some more doom stuff in my life but also a great expansion that many would consider better than the original game.