TAS has got nostalgia value, but realistically a half-hour series (really 20-something minutes minus commercials) made in the 1970s will never be able to compete with something that has hour-long episodes and live-action actors and was made in the 2000s. Even if it fails compared to some of the other
live-action Treks, ENT has got more scope and sophistication than TAS could ever manage with its format.
TAS biggest failing is that you just can't do the same kind of character studies in the half-hour animated format as you can in live-action, so by necessity most of TAS's scripts were geared towards story narrative and nothing else. Yesteryear
was the only exception to that rule.