I'm not saying Avatar is a "great" film, but neither are many theme park properties. However it DID get nominated for the highest award possible in it's Oscar year.
F&F and Transformers are certainly no masterpieces of cinema by a long stretch. However, at least in Transformers case, it works. Even though I feel the ride is a bit jumbled, it works.
Now, some may say that those examples are singular rides, not full lands. IMO, it doesn't matter if this had the Avatar name attached to it or not. If it was being built as an original IP, no one would be bitching.