Agreed, it's pretty unbalanced.

My first fight today was completely imbalanced and out of my favor; the opponent completely outclassed me in power and level.

My second fight pit me against a player who was exactly my level and maybe 4-5k stronger than me. (despite it saying that I'd probably run into a lower-level player). I was actually able to win this one because the other guy's team was poorly positioned compared to mine, but that was just luck and the imbalance is still present.