My experience has been much worse and it all coincides with s2 dropping, so I'm not sure what it could be. I'd say like 85% of my matches in S1 were great, with about 10% with visible, but playable rollback, and 5% unplayable.
Now it's more like 60%/25%/15%. A large portion of playing this game is now wasting my time, and when I play ranked, if I do get a great match, a lot of the time the results don't get uploaded (unless I lose, lololol). It is so much worse at this point that I just do not want to play.
I've had the same experience, the network issues have definitely gotten worse in S2. I've completely given up on playing the game outside of lounges because of it.