I feel with you. I also had several pvp battles, where the opponent had dragons and it just ruins the battle and the fun. I am not even looking for pvp right now since I do not wanna loose my army.
I hope we get alot of complains about that when new players hit the game due to steam ("fingers crossed"), so they will either limit them to 1 unit per account or get rid of them completely (my favourite).
But yeah Dragons ruin pvp and therefore this awesome game.