How is it different from the previous games? I haven't played any.
Doorman:
Absolution
Its a "get to the door" simulator, the levels are not as open and not nearly as big as the previous games, its a bit more linear and more stealth oriented. The previous games put you on a sandbox level, this game has levels mostly split up by doors.
It wasn't a bad game on its own, the plot is kind of cheesy and I thought it dictated too much, you don't even get your signature gun for a while into the game which was annoying.
I thought the production values were excellent though, its not half assed.
I do have one major issue and that is no quick save/manual save, the originals never had that on highest difficulty, but the levels are not designed for it to work without it in this game. The AI paths reset if you start from a checkpoint.