Saw this with the wife, sis-in-law, and kids over Thanksgiving. It was really good. I had no trouble sitting through it with them and even enjoyed it. I think it strayed a bit from the usual Disney formula to stand on its own but stayed close enough to still be recognizable and not be a big worry for the execs.
For instance Flynn isn't a prince he's actually a thief and instead of just being wooed by the princess and having a bit of action at the end he's present and active for the entire film and actually spends the first half of it trying to ditch Rapunzel. Gothel isn't a stock Disney bad guy as she has to plot and scheme to make things work. There's quite a bit of Ursula in her but she has no real power on her own. She has to con the Stabbington (not making that up) brothers into helping her and then double cross them. She's also not after Rapunzel to hurt her, she does her best to look like she's looking after Rapunzel the whole time and in a way she is even though her ultimate goal is to just keep Rapunzel locked way as her own personal fountain of youth.
I really, really, really liked the Gothel/Rapunzel relationship. It was just... creepy. You can see how to an outside observer with no real clue about Rapunzel's hair it might just seem that Gothel is an unusually overprotective mother. You have to know the set-up for her actions to have any other meaning. You can even see how she likely cared for Rapunzel, a little bit, and didn't make her life a living hell. Even at the end Gothel isn't threatening to kill her, just lock her away in the tower permanently. Admittedly not the nicest fate in the world but its not a poison apple.
I also liked that Rapunzel wasn't a blushing "Oh my!" kind of princess. While I'm a caveman at heart I do like that my little girls are going to have a movie with a princess who isn't letting others do it all for her, one who reads, paints, and has no trouble knocking ruffians cold with a frying pan. You even have instances where Rapunzel was the one pulling Flynn's ass out of the fire. Really liked that. I've got no issue with Cinderella or Snow White but a princess who's a bit of an action girl isn't going to be a bad thing. They even made a point of Rapunzel being legal, which I suppose was in there to make the fact that Flynn went for her less creepy for some.
Which brings me to Flynn. He wasn't really a prince, and he wasn't there to rescue to the princess, ala Sleeping Beauty. It felt a bit more like he and Rapunzel were equals in their own ways. His back story is pretty stock tragedy with a nice little twist, his attitude was good, and he wasn't instantly smitten with Rapunzel. Yeah it only took about two days but it's not glancing at her face and deciding she's your one true love.
I will admit, the ending was an ass-pull in a way, however it's an ass-pull that's true to the actual story this was based off. The ruffians were Disney's addition and they did come out of nowhere but this is also a Disney princess movie, I'll let it slide. Let's just assume a Lassie moment with Maximus we're probably better off not having committed to celluloid.
The music was new-Disney which is hit or miss. I think it has a more Broadway feel to it and I like it, I especially liked it here. You've still got a few set piece productions but Gothel's bits were well done and I liked them. The story didn't come to a screeching halt for a big musical number the way it often does in some Disney movies like Little Mermaid or Beauty and the Beast.
The production values were amazing. After watching Princess and the Frog then watching Tangled even as someone who appreciates the art of hand drawn animation it's hard to make the case for CGI not to be a great thing. Rapunzel's hair was amazing, the water effects in the gorge were great, and the freaking costumes were just epic. There's no way you could have done the level of detail in Rapunzel's hair/clothes in hand drawn animation, not and complete it in less than a decade. The whole movie was gorgeous. As a guy who likes purple and green this movie was made for me.
If you want to know the reason for why this movie is the way it is just look at the Executive Producer, John Lasseter. One of Pixar's crew, everything the man touches turns to gold. Even if you don't have a three year old squealing in your ear about how she wants to go see "Punzle!" every thirty minutes it's still not a bad way to spend a couple hours.