IMHO a MMOrpg to be successful needs to have something diferent. No game in the world will appeal to every player in the world, it is impossible...
For me Swtors greatest strenght is in the stories/voice acting. Its like 8 diferent Starwars movies (not counting with light or dark changes) put into a world that you can play with other players. And it is growing. Everyone compares to WoW, I get it, it is the greatest MMO ever but for me it is boring as hell. Having to read every single quest is just too too boring. But obviously its just me....
The mechanics are fun, flashpoints, heroics, operations... diferent, fun, lore friendly (for example putting revan in there.. great right?!...)
And eventually I will leave also... because at the end.. it is just a game