"The interesting thing about Forever is that you can practically cut it in half and see the entire fourteen years of shooter evolution it's tried to keep up with, like the rings in a tree stump. It starts off campy and colorful in a SiN/Blood II: The Chosen kind of way, then it moves into the dark, sweaty unpleasant Doom 3/Prey/Quake IV period when you go into the alien hive (and incidentally, this section contains about as jarring a shift of tone as you can get without splicing five minutes of The Human Centipede into the middle of Mallrats). And by the last mission Duke has finally embraced the FPSs of today, meaning you run around a grey/brown industrial area for a while and then get a shit ending."