I thought the move was really good. I thoroughly enjoyed it, but a few things that bothered me (in addition to what has already been said about the death star redux):
I thought it would've been better to reveal that Ren was Han Solo's son on the bridge right before his death. Ren's emotional issues dealing with it could've been addressed through dialogue on the bridge. Yes, you knew Ren was Leia's kid, but I thought the way they revealed it was too anti-climactic, and you knew from the moment it was revealed that Han (or, "Solo") was going to die. That said, the bridge scene was still well done.
Ren was powerful enough to stop a blaster blast in midair, freeze Ray and throw her 40 feet in the air, and extract the map's whereabouts from Poe, but he couldn't destroy Finn in a lightsaber duel? Yeah, I know he won (and almost killed Finn), but, given how powerful he was, he should've been able to destroy a former Stormtrooper without too much trouble. I'm reminded of what happened when Lando betrayed Han and they opened the door at Cloud City and Vader was there. There was just no chance Han could do any damage to him. I know than Ren isn't as strong as Vader, but he still has the ability to use the force and Finn doesn't (I assume). It didn't really bother me that Rey was able to defeat Ren. I think the implication is that, even untrained (or having forgotten her training, whichever) she's just much more powerful than Ren.
I wish Maz Kanata hadn't been CGI. There was no need for it, it wasn't particularly well done, and I couldn't help but continually notice it. Also, I appreciate the homage to the Mos Isley cantina bar, but it was pretty lame in comparison. The music wasn't nearly as catchy, and I appreciated the vibe of Mos Isley being a "wretched hive of scum and villainy" that just wasn't there at Maz Kanata's.
I don't remember what they were called, but the things Han and Chewy had captured on their ship were somehow too scary and not scary enough. I didn't like that scene at all, although they way it ended (with Rey closing the door on them) was pretty cool.
Carrie Fisher's acting was pretty bad. I thought she sucked the energy out of pretty much every scene she was in. Maybe its because she was in so many scenes toward the end, but once Rey was captured by Ren, the pacing got really uneven and the story started seeming like a series of cuts.
Why was Ren punching his crossbow wound? I didn't understand that.
Rey was really just an excellent character. Excellent actress, excellent chemistry with every other character, excellent action sequences, and excellent dialogue. I'm old-fashioned enough to generally prefer my action-movie protagonist to be male, but she made a convert out of me. Plus, she's as attractive as Kiera Knightly and strikes me as having more depth.