I only have access to a few servers here, so perhaps I notice defects more.
I really dislike the servers with extra 'rules', as it seems to either ruin the point or be a platform for petty managers who enjoy 'mod'ing. For example, one server has an 'only SF in uncap, and can only fire if fired upon' rule. Its ridiculous, and even following this rule, I got kicked because I was more clever and faster on the draw than a member of the clan that was running the server. So I end up playing on one server usualy, the one with vanilla rules, the way it was designed to be played.
I really enjoy any kind of free play. Obviously I don't agree with intentional TK, and I understand the desire for variety with FF or infantry only or such servers. But I feel that finding innovative or clever ways to get the upper hand shouldn't be punished - in fact it seems to what makes the game so much fun. And if being able to slip through defences to blow up enemy radar or steal a jet or whatever is the way to do that, than good for the guy that has the wits to do so. If I wanted a nerfed or modded game I could play one of the countless scripted shooters out there.