I've had really bad unplayable net jitter/lag since last october. Whenever the previous 6 heroes were released I started playing again and was having a pretty good time, though at some point at random after a month or two the game just had this horrible lag to it. I couldn't really play games...
The steam browser pings/minute and lowering it to the lowest amount actually really helped me for the moment! It's worth a try if you haven't yet. Only played the new gamemode atm (don't know if it works differently based on the gamemode but I'll update later if it stops working.)
I was able to play the game fine for a while actually, got a solid 150-200 hours before this issue started and now it's net jitter everynow and then that makes the game unplayable. Anyone else like this too where you used to be fine?