The trailer looked pretty cool. However, the trailer for Phantom Menace was also good, and I ended up hating that movie (and the rest of the prequels).
On the plus side, the Force Awakens was a good movie (even if the beats were way too similar to A New Hope). Given that and the trailer, I expect we'll be in for an entertaining movie, at least. It's very doubtful it'll be better than Empire Strikes Back, but I'd wager a good amount of money it'll be a damn sight better than Attack Of the Clowns...err...Clones.