disarmyou: I can give you a description of what I am seeing.
I log onto the NA servers, my ping shows as 160-170ms while in game (on the in game display). This value does not change during play. When clicking around in game, my character will freeze for approximately 2-5 seconds, after this time elapses then my character will "fast forward" or what is known in the gaming world as "rubber banding" forward to catch up.
This effect is common between Diablo, World of Warcraft and League of Legends. I have also noticed similar behavior with Hearthstone though as far as the game is concerned it isn't very noticeable.
These problems started occurring approximately 5 weeks ago, and prior to this I did not have any issues with any of these games.
Let me know if there is anything I can do to assist with this (tracerts etc).
Do you know any of the IP or the server for diablo so I can have a try too?