My initial reaction was that it was decent, not great.
Finn - the most compelling character, for me. A solider that is highly conflicted about what he is ordered to do. The scenes where he removes his helmet, hyperventilating, and his hesitation at the village, were the best character development scenes. There were enough parallels to "real life" that helped me buy into this character. He had charisma and fun moments to not be too overbearing. The only real replacement for a Han Solo type.
Rey - I'm more on the side of Landis on this. Her use of the force, after a day, was tough to accept considering the precedent we have seen with other characters that took significantly longer periods of time to become proficient. It looks like they will reveal Rey as a former student, which mitigates some of the issue but I did not like her being portrayed nearly on par with a Jedi. Flying the Falcon well immediately, when it has been established that only experienced pilots familiar with her can do it in battle situations (Han, Lando). All the technical knowledge? A very good fighter against multiple opponents simultaneously?
Yet, what we know of her life (so far) is simple: a scarp scavenger, alone. In the desert. How could she have such wide knowledge of all these things, that are usually divided up between several characters, let alone one?
I also think the actress was miscast in this role. My thought was a Charlize Theron in Mad Max type would have been a more convincing Rey.
Sounds like I'm in the minority, though. Perhaps the plot will fill-in some of the gaps IE she has been training since youth as a Jedi. But she felt like a Marvel Comics hero, while Finn felt more realistic, relatively.
Kylo Ren - Didn't love that he took off the mask. This may have been the hardest character to make work... you have to show power but serious conflict and vulnerability. That's not easy to pull off. They did much better than Anakin in the prequels. There is tons of room for development here. Adam Driver's portrayal grew on me the more I thought about it.
Story/plot: Is the First Order supposed to be more powerful than the Empire? Their weapon was much more impressive. Another iteration of the Death Star was disappointing. They could have thought of better plot devices here. Space battles were surprisingly flat as several people mentioned, go back and watch the Battle of Endor, it holds up really well.
Overall, I was entertained. 95% on RT though? Yeah... but I respect how hard it is to satisfy the super-fans and bring in new ones. These characters are some of the most loved in cinematic history.
It was better than the prequels, though I did like Ewan McGregor a lot as a young Obi Wan. I'll be interested to see what the two standalone films will be like, in comparison. I was surprised how much of a focus the old characters were, I was expecting just short cameos.