I really liked all the characters, they all managed to avoid the "Hip New Kids!" syndrome that characters like that tend to fall into and all be genuinely compelling and likable, and you really did feel for them.
Rey was amazing and is one of the best female leads in anything I've seen in awhile. I also really like the fact that they didn't push the strong tough independent woman thing so far that it got hammered into our faces. She definitely got miffed at Finn for always pulling her by her hand, but as soon as she realized he wasn't being patronizing and was just being concerned and helpful she stopped snapping at him. From that point on, she was grateful for his help, and hell, she helps him just as often, and gets herself out of sticky situations very well. I don't think she'll end up being Ren's sister, I'm more on the Luke's daughter boat, if only because of Kylo Ren specifically mentioning her dreams of an island surrounded by water, with Han to replace the father she never knew. Definitely glad to see her believably progress in her Force powers, in that she's just that powerful in it despite being untrained. Both her and Finn managing to use the lightsaber competently was naturally explained by both just being good in melee combat as well. Super looking forward to Episode VIII if only for that cliffhanger.
Finn was also amazing. Very likable and fun, and pretty much exactly the hero you'd want him to be. You definitely could see what he was going to go through a mile away, but he's played so well it's fine - "Tropes Are Not Bad" indeed. Definitely wanted to see him stop running and start being a hero, and his interactions with everyone is what made him. Especially with Poe, who in lesser hands could o easily be super grating and annoying with the snarky smug jackass routine, but played off so well it's fun. I'm perfectly happy with how they sorta glaze over how he doesn't die after the TIE crash because it meant he was alive - this is Star Wars, so I'm sure he'll have some novel or comicbook explaining how and why if it bothers me that much.
I never would've guessed that Kylo Ren would've essentially been an angsty teen who can't control his emotions, and even more I can't believe how well it works! He's menacing right off the bat from his first scene, and his wild outbursts where he just starts breaking stuff were actually pretty entertaining, and not in a crap movie way - I even like how it's known within the First Order he does that sort of thing regularly and it's best to just walk away. Once he takes off the helmet he.....definitely loses the menace, but they tend to be for emotional scenes, so the emo teen nerd look actually works out. Kinda regret not buying the 6" Black Series figure now since it'll be tougher to find until they dump a bunch more out after Christmas.
The old cast were good, Harrison Ford was exactly like he was, despite being older, and holy crap, Carrie Fisher was lucid and sober the entire time! They were both believably the exact same characters as before, just older, and with the sense that they both went through a lot of crap between movies. Han Solo's death.....well, come on, as soon as they revealed that Ren was his and Leia's kid, you KNEW he wasn't going to make it past this movie, and as soon as he confronted Ren that was it. The "Help me have the strength to do what I have to do" line was just slowly twisting the knife in before it happened. Luke didn't do anything beyond turn around and look badas with a beard, but dammit, like I said earlier, that last scene just makes me want to see more.
The First Order seemed like an answer to people who thought the Empire just wasn't Nazi enough. I did feel a little robbed that Hux didn't die when the Starkiller blew up, since the first movie at least had Tarkin go with the Death Star. I suppose it'll make it more satisfying when he inevitably goes. I raised an eyebrow at their being ANOTHER thing that destroys planets, but it was at least kinda different enough, though I appreciated Han Solo's lamp shading of it. Did they totally just blow up Coruscant though? Or is it some other planet that's explained in some novel I'll never read? I kinda hope it's the former, but whatever. I'm still not sure why The Resistance wasn't just The New Republic, but again, whatever. I hope we see more of Captain Phasma later on,
At first I kinda liked Snoak, because he was just this giant guy, but then it turned out to be a hologram and I got less and less impressed. He has two more movies to be built up, and I'm curious if he's a human who got super messed up or some alien. Maybe he's the original race of Sith? I don't know enough to even guess, though Clone Wars had another giant guy, though it was just in Yoda's weird Force Vision Quest.
I'm sure I can nitpick a whole lot more, but it doesn't matter. I did enjoy it a lot, though I'm still not convinced they can make a Star Wars movie every year without it wearing thin. My worry is that each of the "Other" movies might dilute it all and make the next two proper episodes seem weaker for it, but we'll cross that bridge when we get there.