I didn't like Tangled either, but I actually do think it could make an excellent ride. Just because a movie is bad doesn't mean a ride based on it is going to also be bad. And likewise not all good movies sound like good ride concepts.
For example, I absolutely adore Ratatouille. But I never thought it would lend itself well to a ride format. It has an incredible story and characters, but the environments aren't very visually interesting. It's predominantly quite bland industrial kitchens and other ordinary looking buildings (only with some brief flashes of more classical Parisian architecture). Ratatouille is a movie I love watching, but had no interest whatsoever in seeing adapted into a theme park environment. And as it turns out, the ride confirmed my assumptions. There are plenty of Disney movies that I really love but don't think have much potential as rides.
On the opposite side of the coin, I dislike Tangled and don't like revisiting its story. But visually I think it lends itself VERY well to a theme park ride. It has lovely environments. If given to talented imagineers with a good budget, it could be an incredible ride. They're currently building a Tangled ride at Tokyo Disneysea as part of the Fantasy Springs expansion. It's a boat ride with a relatively smallish show building (38,900 reportedly, similar to Epcot's Mexico ride, but I dunno how many levels it has or if there are any drops). So it doesn't seem like a full-on E ticket. Even still, the Asian parks often get assigned larger budgets and far more talented imagineers than the other parks, so hopefully it'll be a fun little ride regardless. We'll see.
Avatar turned out to be a similar situation to how I feel about Tangled. I don't like the movie at all but the visuals were gorgeous and lent themselves well to a theme park experience if well executed. And thankfully the land ended up being gorgeous as well. I have some issues with the rides, but that's largely because I don't care for simulators and the over saturation of video screens in modern rides. And consider the boat ride too short and lacking in animatronics. Not really the IP's fault though, there's still a ton to love about the land as a whole.
I love Princess and the Frog! I'm upset about the bad stuff! I love that idea!