I liked it, it was cool. A couple of the parts were nearly tear-inducing from the nostalgia, especially some of the scenes in the Millenium Falcon.
The music score was a bit more subdued than all six other movies; none of it was "in your face" to make memorable scenes. As much as we all love to hate The Phantom Menace, nobody can deny that the fight scene with Duel of Fates blaring is one to remember. Or what about The Battle of Hoth in The Empire Strikes Back? Don't get me wrong, John Williams did some ingenious things with the music, but it seems like JJ Abrams didn't let the score take a front row seat. This is something George Lucas did very, very well.
I'm disappointed that the story is basically A New Hope 2.0: formulaic. I also think Kylo Ren's light saber was an uncivilized spin on the galaxy's most civilized weapon. Also, Rey's all-of-a-sudden aptitude with The Force just seemed way too convenient. Fin was also unexpectedly good with a light saber - why?
Overall, I'm glad I saw it, but it doesn't meet the level of the original trilogy. It absolutely blows away episodes 1 through 3, though. That's without a doubt.