That is true, furthermore Overload has an usermade campaign called Overload: First Strike, which is a conversion and upgrade of the entire Descent 1 campaign to Overload. Additionally I recommend Desecrators, which is a Descent-like with procedurally generated maps. Think Sublevel Zero or Everspace, except good.
Forsaken for n64 was pretty good too.
Whoa, I just remembered playing forsaken multiplayer at sleepover when I was a kid. Thanks for reminding me!