I have to say it's pretty freakin' awesome. If you enjoy star wars "lore", then you'll love it too.

Pros:
Rich Storyline for 4 distinct classes and 2 sides, e.g. some quests are just warrior only
Can easily play most portions as a single player, but there are rewards for grouping (social points)
Neat crafting mechanics (you can "farm for free" or send out "companions for credits")
Mission System is easy to navigate.
PvP
Ship combat
Light side vs Dark side
Rewards for multiple toons (Legacy Points)

Cons:
Still buggy at times.
Laggy in spots, especially spaceports.

Overall, I am really hooked on this game even more than WoW. And like every other MMORPG, I can't decide on a class so I have a few in the 30's (50 is max level atm)