Can you describe the lag in more detail? Was it input lag, rubber banding, delays?I had a very noticeable lag problem while playing even though I was the only one online. I don't know if it's ping (I'm in East Coast DC area) or latency, but it definitely ruined my experience. I have good internet speeds and have no issue playing other online games, so it's not my side.
Most people seem to be able to play fine; I'm across the ocean in Europe but still can play without lag.