After upgrading my videocard I've had nothing but graphic issues with this game. Character sprites are choppy looking, effects look wrong and portions of the ground are covered in black dots, seemingly at random. Currently using Windows 7 and a Nvidia GeForce GTX 750 Ti videocard.
Also note though the game runs perfectly smooth with little to no lag at all. This is the only game this happens in. I know this might sound shallow of me but having a game that honestly looks like this because i upgraded my videocard ruins the enjoyment for me.
Examples of this are as follows.
Blocky character sprite: http://i.imgur.com/n6l7vDS.png
Blurry / Blocky damage numbers: http://i.imgur.com/utWHOU7.png
Black Dots: http://i.imgur.com/NSImpHU.png