Yeah, I really liked Solstice when she was introduced in "DC Old". She had a nice origin--daughter of Indian archaeologists working in Pakistan that could have given her some common ground with Wonder Girl (who also had a nice origin in DC Old as daughter of a single mom college professor).
Now they are both damaged youths with no real back story or identity. Cassie's armor has some weird connection to space alien Cambodian gods. And who knows what the story is with Kiran. Is she even Indian any longer? Pretty soon, there'll be a letterist error and she'll be blue-eyed "Karen". (PS. I dropped Teen Titans around the time it became "Robin Presents").
Considering how fun "Young Justice" (Peter David) was, and what a team adventure "Teen Titans" (Geoff Johns, Sean MacKeever) was, sad to accept what DC Nu did to "Red Robin and the Outsiders (no, literally, because they sure ain't insiders)".