one game against a value shaman deck is enough for me to want to auto concede in the future. The game did come down to the wire in the end but I can't be spending 30 minutes on a single game I might lose on a regular basis.
It's unfortunate because I love playing control decks, but if you are serious about climbing the ladder it just isn't worth it to go through some of the control mirrors. I usually wait until rank 5 before I start playing control.