Have you ever considered it may be people you are in a match against in a game?
Not saying you have or haven't done anything naughty in an MP match, but one big reason they will report you is if you are using hacks, or if you are rude over text/mic and annoy people.
I have tried it with Morrowind, the optimization is poor at the moment, so having too much mods on at once = low fps. But so far it looks nice, but needs as said more optimization and tweaking so people with decent cards can get 40fps+ with it.