Well, I would give it around 6.5/10. It's not horrible but I expected much much better.
I have to agree with most things Zbyl say. Why are there a New Republic AND Resistance? How did the First Order rise from the ashes of a destroyed Empire which had no more power? Where does Snoke come from in a Jedi and Sith-less galaxy? (Atleast Ben was explained). And to answer the question, it was stated in the movie Luke removed himself after his student fell to the dark side. Ben Solo that was. If any other students where mentioned I missed that, just the one. Which answered where a Sith came from post-ROTJ. But still, what's up with Snoke?
Though also in TPM's defense, it's a lot easier to portray a diplomatic galaxy-wide democracy than it is a dictatorship.
Some other irksome stuff of the movie:
* A lightsaber is a Jedi weapon. Here; everyone can just use it with the flick of a button, even Finn. Heck, he even beats the Jedi, the ones who where supposed to be the only lightsaber users without cutting their own limbs off? Why?
* Likewise the female Skywalker (no way she's not related) suddenly gaining all powers without training, you know, unlike Luke or Anakin, THE MOST POWERFUL JEDI IN THE GALAXY mind you, seems... well, super-cheap. I was kinda expecting the Stormtrooper to walk to the door and then sarcastically comment he's joking like the first time... or when he opened the door Ben Solo was there instead. But big was my suprise when it turned out... it was working instead. And... out of the movie into the "wtf?" area.
* Complete rehash of IV. Droid send with information to planet made of sand, meets a Skywalker, meet resistance, blow up superweapon. Well, all check.
* Talking about superweapons... really... REALLY? You don't need to have a 4x Death Star to make a good movie, thank you. Infact the stupidness of this weapon did infact degree my enjoyment of the movie. Seriously, no more superweapons please. This isn't The Old Republic where BioWare is so out-of-ideas there are 3 super-weapons per planet to take out, if not more.
* Sometimes a bit too much overacting on Rey and Finn, which got annoying. When they weren't shouting or going "woooooo, that's *one* good pilot!" it was much better.
* A distinction was made between stormtroopers and clone troopers was made, which was a nice touch, but they didn't really went far with it afterwards, sadly enough. Talking about stormtroopers, they HIT stuff. So non-Star Warsy. Total canon-break
So yeah... definitely too many points of annoyance to make me go all "great movie!"
Sticking close to ANH, then completely overpower *everything* (super-weapon, Jedi) doesn't make a better movie.
EDIT:
Thought of another "why?" during the movie...
* With the bombing run they use X-Wings too, X-Wings are fighters though, the Y-Wings are for bombing... but... no Y-Wings anywhere to be found. Why?