Been here since beta. I used to be far more of an arena player and once only played that. Eventually I got tired of the format never changing and started grinding ladder more often.
I'm still a decent arena player but not as good as pre GvG when arena was really fun. I once got 12-0, 12-0 ,12-1 back to back. I've lost 7-3 with decks that were OP and won 12-0 with decks that looked mediocre.