This is a really good movie, as all DC Comics animated films seem to be. The interaction, leadership and romance between Koriand'r / Starfire, and Dick Grayson / Nightwing is fun to watch and grounds the movie.
The plot of course delves into some topics very familiar to fans of the Teen Titans TV series. That is, the who Tara Markov / Terra, and Slade Wilson / Deathstroke theme of betrayal and family which was a major plot in the series.
Did I mention, I love Starfire! Its good, she's not just eye candy... Ah, not that she isn't being used for that to some degree. But there's a whole Wonder Woman, thing going on with her as well. So is the next movie going to deal with Koriand'r and her homicidal sister's, big issues?