What acc level are you out of curiosity?
When I was in the mid acc levels I found a lot of imbalance in the match making. Sometimes there would be people who were a lot higher acc level than the rest of the team so while I was still learning the ropes it got frustrating to get owned. It got a lot better at 30 as you build up a wider sample of games the system can use to determine a more realistic skill level, but it still was anything but perfect when I last played.
I got pretty good, usually would get at least 1.5/1 most games at level 30 which isn't bad at that level. But even after 1000 games played, there would be occasional games where I'd get some real lowbies who went 0-15 (usually if they were partied with another 30), then sometimes I'd get matched with some of the top EU players.