True, it had limited motion and a lot of repetition, but the quality of the artwork was superior to contemporary shows from Hanna-Barbera.
There were also various infamous errors: wrong colors, misaligned cells, continuity errors of the wrong character appearing in a place, and so forth. You have to be able to accept those in stride.
I really like TAS. At the time it ran, I had only seen a minority of TOS, and it carried me through.
TAS has a few excellent episodes, a lot of good ones, and many intriguing concepts. Every Trek
series has episodes that are worse than the best of TAS. Even though it was a Saturday morning cartoon, it was capable of mature themes worthy of any Trek
Especially if your goal is to watch all Trek,
TAS is essential.