TCP is pretty well suited for MMORPG's, World of Warcraft uses TCP too. UDP is needed for games that need more consistent accurate response times, like FPS and

TCP is pretty well suited for MMORPG's, World of Warcraft uses TCP too. UDP is needed for games that need more consistent accurate response times, like FPS and racing games. Hopefully when WebRTC datachannels get browser support we'll finally see those too :)