The only reason I am rating this just "Good" is its age. I remember when I first played this way back in 1997. It blew me away back then, a proper milestone in Quake modding that everyone should give a go.
IIRC it also is the first mod with cutscenes, or at least one of the first. Some of the levels are a bit jank, but the overall atmosphere is great, and it has fun weapons and some decent new enemies.