They've taken Robin's new self-worship personality to the extreme and it's incredibly annoying.
Cyborg is unnecessarily retarded but somehow a scientific genius at the same time, and is the second-most prone to overreacting and screaming about everything (behind Robin, of course).
Raven is pretty much whatever the current episode calls for. Her only really consistent character trait is being the person who gets really angry because that's apparently funny. In one episode she'll be mellow, in another she'll hyperactive, worldly-wise in one, retarded in another, passive to involved, bitchy to sweet, the girl's just all over the place.
Beast Boy was already pretty goofy and Starfire was already kind of a doofus, so they melded somewhat well with the new style. They're honestly alright despite the show taking those traits to a bit of an extreme, but they still tend to join the rest of the cast in being incredibly obnoxious and trying too hard to cast their meme magic.