I play capture the flag a lot, so the tank and the running is best for me, and the tank would be nice in death match...survival would be easy with the runner.
I have part of what everyone tells me...
Rambo's rifle
Fast Death
Laser Scythe
Chain Thunderbolt
Anti-Gravity blaster. Since I added Chain thunderbolt, everything's been easier on me, so I might tweak mine....I'll replace my scythe and Fast Death, With Emperor's sword and Plasma pistol.
Even with the splash damage, the Plasma pistol is extremely hard to get with. But yeah, the Emperor's Sword is pretty much a staple melee weapon until the devs make something even more powerful!