The difference is, you need to go and watch the complete walk through at lv 32 for four players. This is a perfect example of how the game is different. Yes there are going to be similarities, but I play wow with a very good guild. From watching that video I can see all the differences. There is a lot more story driven quest with full on dialog. go to Fileplanet and download this video and watch it. I think you might be surprised.
Search for this text, I would post the link ,but its telling me its too long.
Star Wars: The Old Republic 'Taral V Walkthrough' Trailer
Creator of the Neverwnter Nights Eye of the Beholder Series of Mods.