I recommend that anyone who likes TOS and TNG give TAS a try, and I'd also suggest that if they try a couple of episodes and it's not their thing, then they should stop watching because it never changes. Sometimes the Spocks get bigger, sometimes the science gets worse, but it's pretty consistent in tone and quality. To my recollection.
Like any Trek, it has a minority of gems, a minority of utter garbage and a lot of average but entertaining stuff sandwiched in the middle.
It has the advantage of being short though. If it's bad, at least it's quick and painless.
Definitely worth it.