I didn't find it quite as disappointing as you, but yeah that whole carnival thing was ridiculous, and the one thing I took away from this entire movie is that Damien is a complete fucking douche. I literally wanted him to die at every single moment of the film, even the end.so Justice League vs Teen Titans is ... well its disappointing. Its filled with bits of awesome and then 10 minute interludes of WTF. I love a lot of it but i swear its schizophrenic as hell. The carnival montage???? what did i just watch. Just more wasted opportunity.
I did enjoy the obviously gratuitous shots of Starfire, first on Skype and then when she did her "suit transformation" bit. There was literally no other reason to have those scenes in there but for horny teenage boys, and pervs like me. God bless 'em! I could get used to this version of Starfire I suppose.
Costume change video in spoiler. No actual spoilers. Skype one is better, but I'll let you look that one up or watch the movie.