My favorite weapon was the Blaster in Tribes 2.
It was probably the WORST weapon ever made in any game. And I was the only one I ever saw who used it effectively. Nothing better then seeing: "So-and-So was pinged to death by Mantus" when you kill some one.
I hear they are replacing it with a shotgun in Tribes Vengence
...I hope they atleast keep the shocklance which comes in as my second favorite weapon.