Ambiguous or even faulty rules, rude administrators (especially CZ/SK), often swearwords and abuse in chat used (CZ/SK version). Even admins use swear words in replies to users i.e. "an*l alpinism" or "as*-crawler" (in my case). Instability/errors in GUI. If you're calm, asking for nothing just paying for Uridium, everything is fine. But if you are at the top with ship equipment (no much further fees expected?) or mention any technical problems with your ship in chat, troubles begin (jeer, ban, blocking, ignoring...).