Based on everything I've heard and read about the new show, it seems the people in charge don't understand (or want to understand) the essence of what made the original show great, which can be shown a lot by the removal / downplaying of certain characters (and their reasons given as to why), and the noticeably altered style of...virtually everything. Animation, artstyle, writing, characterization, they are substantially different, and not exactly in a good way. The result is that the new show overall comes off as a pale "modernized" imitation of the original show. At least Teen Titans Go can be commended (from a certain point of view) for taking a different direction with the source material (reception of that point of view notwithstanding).
The short of it is that it seems to be a pretty mediocre reboot of one of their iconic shows, which is kind of a shame IMO. The CG Courage short from a couple of years ago was great, and very similar to the original show; so it's not like CN is absolutely inept at revisiting their older works. They just seemed to get a really weak production team for this reboot in particular. I think the new staff would had been better off working on a unrelated new show instead.