It was basically Doom 2016 3 years before Doom 2016, but with more emphasis on melee combat and with a comedic, politically incorrect 80/90s action hero styled protagonist with ridiculous one-liners in the vein of Duke Nukem. It's a bit longer than it needs to be, the last few levels drag a bit and there's a few really annoying enemies, but other than that it's a really top tier shooter.

Besides how can you not love a game that opens up with the protagonist singing Stan Bush's The Touch?