I think the noobs on the servers are fun (to kill)!
Lim-Dul and me sure had a laugh when we could backstab them and detonate stickies at their feet while they were oblivious of what's going on. They make for good target practice
The noobs on server 5 were a delight to play against. Me and Lim had a laugh at them as well.
The best one had to be the Spy who either disguised himself as a Heavy or a Scout, I mean, you could spot this guy coming a mile away. There was one instance, on Aqua, where I don't think he realised as a cloaked Spy you have to avoid contact otherwise you become temporarily semi-visible. I was looking down this tunnel, standing still while my team-mates ran down it. All you could see was this silhouette of a Blu Heavy banging into them all. The funniest thing was I didn't move at all and he actually ran up and started stabbing me from the front. He was basically just trying to shiv me to death.
Suffice to say I BBQ'd him vigorously.
So yeah. Keep the noobs. They're good fun.