Absolutely nothing happens. Sure monsters appear every thirty freaking seconds and weapons get more powerful and varied throughout, but all that gets old really really fast. and that's the whole game. The level design is also pretty confusing and difficult to navigate sometimes. Maybe that's how shooters did it in the older days but really, it isn't that entertaining. More or less annoying.
when i rented this game i did not know it can hold 3 games doom 1,doom 2,doom 3(with 2 more dlc campians)
doom 1 and 2 are ok but on doom 3 the atmosphere is tarufing so much jump scares vary dark rooms more realestic monsters more texters to just about every thing!
The only gripe I have with this game is the fact it's a spit in the face of the original Doom 3. The load times are extremely long for a game ported from the year 2004, but it also has Doom 2's Wolfenstein aspects censored removing the SS soldiers and Wolfenstein music.
As a fan of the originals this port is complete garbage and just lazy optimization. Play it on Xbox/PC/or download from PS Store, because the disc version of this game for PS3 is terribly optimized and a waste of time.