Recent reviews by Arie - serveme.tf

The servers for this game are a joke. They run at less than 5FPS at the beginning of the match, causing immense lag and desync for the first 10 minutes. The fully client-side hit detection doesn't help matters either.
It only gets slightly better after those first 10 minutes ,but the server tickrate never seems to get to the target of 30 until there's just a few players left and you actually have a chance of some fun gun battles that don't feel like bovine feces. Unless you end up fighting some warping, high ping player, that still manages to hit you just fine. The servers seem to accept any kind of garbage and nonsense the clients send it, so expect to get run over by cars that can drive through walls, or that aren't even close to hitting you.

The client is just as terribly optimized as the the server. Low FPS, second-long stutters, random FPS drops, crashes. The web-based menu system is completely unreliable and riddled with bugs. It even has a reload button so you can attempt to get to see all your squad mates.