I seriously dislike Robin. If they wanted an angry, murder happy Robin, they should have gone with Damian. It would his character better than the original Robin.
Raven looks like wreck, I find her too emotive. Her character arc is learning to express her emotions freely. Seeing her so expresive would ruin that for me. They also made her look like the victim of demonic possession from horror movies. Not my cup of tea. Was only me or was she fighting instead of using darkness to attack?
How come beast boy only got a scene? He got the least revealing info from all four. They could have cut a bit from Robin and Raven to give him a line, but no a cgi gorilla is all we get.
Finally, Starfire. Was she shooting fire out her hands? I know fire is in her name but that's a stretch. She also looks like she was confused about her own powers. She always seem confident what she can do and using her powers, so seeing her like that does not give me a good impression on what the character will be like.
From what I gather, the series will be Robin and the Titans. Everyone needing Robin (despite his edgyness, he looks the most composed) to solve their individual issues and, apparently, in helping them with their powers.