SWTOR is a great MMO and RPG. By combining the two together it makes for an ambitious and exciting new experience. It greatly draws its influences from games such as World of Warcraft but don't be miss led by this, you will be surprised how different they actually are. It uses some of the familiar interfaces and gameplay mechanics but the overall look and feel of the game is much different. The combat feels very nice and fluent, not the usual stiff combat you see in some other MMO's. The story line lasts for about 200 hours for each character who all have a different story line, which in todays terms is well worth the money. The actual RPG element is awesome, Bioware stayed true to its roots with KOTOR and brought in new updated RPG elements from Mass Effect and Dragon Age.
Overall this is a great game. If you are looking for a new experience with MMOs definitely give this a shot.