I f*cking love instagib and miss instagib UT so much. In fact, I reinstalled UT3 just to see if anyone still played instagib and I found like 3 CTF servers full of bots, every single night!
Maybe UT2004 still has an instagib community?
Back on topic, I did look at ShootMania Storm. But people on the Steam forums keep complaining about how low the player count is. And that's never a good indicator to the longevity of a game. I just don't wanna throw away $20 for a game that's going to be dead soon.
Might consider it during a Steam sale if the player count picks up.