Why do the bots uses the UZI and the SHOTGUN close to the other worms and don't get any damage?
I've tryed to use the shotgun like them and got hurt!
They walk upon my worms and start shooting, this way they can't miss a single shot, and they don't even lose a single hp!

I agree, you should not catch flack from either of these weapons.. however, at the moment you can get away with it by being at a precise distance or standing directly on another worm's head with the uzi aiming downward for example...

Uzi is generally bugged, you can sit on opponents worm head and shoot all 10 bullets in it without being harmed, and it wont move so you cant miss :\

Thanks for the info guys, I'm bugging it for the weapons guys to have a look at.