It’s alright. I was never a big fan, but I thought I’d get be it another try and finished it.
Still kind of meh to me. Even the multiplayer is off. None of its standard maps are suitable for just two people. Too big. Even for four people.
Still, if you like FPS give it a try.
I’d personally skip it and try Quake 2, or even the Quake Total Conversion, X-Men: The Ravages of Apocalypse.