This game has probably one of the most satisfying FPS controllers in the genre. It almost feels like you're doing drive-bys on those loser dinosaurs. All the weapons feel satisfying and the death animations are gruesome. Platforming kind of sucks, and there's plenty of it.
Hunting for keys can be a pain in the ass since the levels are large, but it didn't annoy me as much as it did in other old school FPS games.