Basically I play on EU, but sometimes I play on US servers. I played today too, but my last opponent was waaay too strange: he didn't do any scouting, properly reacted with any scouting (created wall against hellions), and what's more suspicious - he looked everytime in my unscouted base (which can be seen in replay with player's camera mode).
Replay is here: http://www.ultralisk.ru/repa/12666
Right after the game I used option "To file a complaint" (don't know how to spell it right in English, because I have a Russian client) and selected "Cheating" category of petition.
So there's a question: should I do something more or just sit and wait?