The art is fine, with a unique art direction that we should really attribute to the manga, but there are a variety of aspects which seriously fall behind. The animation is stunted, the fight scenes are awkward, the backgrounds are grainy, and the characters suffer from what I term the 'dreaded mask', where facial animation is not properly applied when and where it absolutely should be.
The sound is just barely the strongest aspect of this anime, largely thanks to the soundtrack, which oscillates from soaring and orchestral to synth-heavy and electric. However, there are still a lot of problems in this category as well. The voice work is corny and unremarkable, the sounds of life sound artificial, if they're even there at all, and they also rely on these cheesy stock sound effects way too much. One jarring example is how they use the THX Deep Note sound, which is that loud 'bwaaah' noise they play alongside the THX logo, on two separate instances. I don't even think THX was affiliated with this anime to begin with, so hearing that sound was downright bizarre, and i had to go back a couple times just to make sure I wasn't imagining things.
The characters are generally bland, with little in the way of characterization to separate them from one another. As such, it makes little sense to say who's the relative 'best', but if I had to I'd say it's a tie between Taishaku-ten and Ashura, because they're the only ones who don't fall quite so neatly in the generic character bins that all the others do, but it'd still be a real stretch to say they're 'good', per se. Overall, RG Veda is an ignominious example of a failed adaptation, a product which is thoroughly boring, and ultimately, forgettable. Don't waste your time with this one.
