In a gamemode that should be promoting accurate aim and careful shots, the Rocket Launcher does both by giving you splash damage that can just let people spam it and reach the top of the scoreboard with no care for their aim.
And why do you need to pick up ANY other weapon when your fucking Pistol can do 20 damage per shot to people who can only have 150 hp, and has a lighting fast reload. Honestly, I'd make the pistol a pick up and have the SMG as the first weapon, giving players incentive to pick something else up.
The Sten Gun is a fun concept, but some balancing'd be great. I hate it when I get fucking SNIPED by the Sten. Bascially, I'd lower it's accuracy to encourage getting close to unload hell, along with increasing damage falloff at range. The sewers of dm_2fort were effectively shut off by one guy that had this thing. Getting anywhere near him would get you killed, even LOOKING at him would get you shot at.
Surprisingly, despite it's amazing damage, I think the Super Shotty is completely balanced. I can't find anything wrong with it in terms of cheapness. Amazing close range but has a vry bad accuracy and quick damage fall off. I'd say keep it as it is