I think the
art style in the show is fine. It's not my cup of tea, but it's not inherently bad or ugly. It looks like house-style American comics, which - considering the franchise is probably pretty appropriate. The color palate is a bit flat and uninspired, but that's to be expected for a show like this made on a smaller budget/quick timetable.
I think the
character models, environmental models, and general modeling is also good. Nothing has obvious flaws, there's no jaggies or stray polygons poking out of things.
The
texture work on show is also fine. Nothing clashes too much, you don't see any obvious low-quality textures, things generally look like they should. The cell-shaded look of the character models don't clash too much with the slightly more realistic textures of the environment.
The problem with the show's "animation" is literally just that - the
animation. The way the characters/objects animate and move. This is by far the hardest part of most animation, 3D or not. Getting the movements to look convincing and not stiff or programmatic. The clips I've seen have been a marked improvement on the first season where character models - and character faces particularly - looked stiff and lifeless. Here, I can tell the animators are going off of well-designed storyboards that are conveying a lot of personality in the facial animations and that the show is being animated with the traditional key-frame model. The problem then is that a lot of the tweening looks like that - stiff and programmatic between keyframes. Objects/body parts/entire characters moving in straight or very mathematically precise vectors instead of replicating anything organic. No attempts at creating blur-frames, very little transformation of the models to imply extra motion, etc, etc.
This stuff is hard. Big productions full of animation veterans have problems with these kinds of things. (The Clone Wars guys have been doing their thing for well over a decade and still can't seem to get this stuff right.) Start up studios really don't stand a chance unless they manage to get some kind of wunderkin on their payroll who is the next Picasso of animating. I think the 3D animation industry is finally beginning to learn to incorporate a lot of the tricks of 2D animation that has been finely honed and developed for over a century instead of just doing the Pixar-model on a budget of very smooth animation on a budget. Films like the Spider-verse movies and the recent TMNT cartoon did a good job of replicating the whole "animating on fours" look of traditional animation, and focusing on doing as much hand-crafted model manipulation versus letting computers do automatic tweening. Hopefully production houses like this will begin to take notes and learn to improve in this realm. Because as hard as it is, it's not impossible; these animators just have to do some real studying and learn to work outside of their comfort zone. But if small Japanese animation studios like Orange can put things like this out on TV-Anime budgets, someone backed by Disney/Marvel ought to be able to do something half as good and they're not even in the same ballpark: