It’s 70s Saturday morning animation in the trendy hot pink, orange, lime green and purple of the psychedelic era.
It’s got a lot of episodes written by TOS writers that got reworked from live action, but also some very out there original stuff. Roddenberry really pushed the writers to take advantage of the animated medium.
It’s trippy and worth your time. A couple of episodes, including Yesteryear, are S-tier.