How does it compare with the 1990s series or the 3 live action movies? Or was it after your time...
The new TMNT series is MUCH, MUCH better than both the 1990's series and the first two live action movies. Have not seen the third (most recent) live action movie so I cannot comment.
The new series has something to appeal to all age groups. For parents, there are tons of references to stuff from the 80s and 90s (or earlier). E.g., original star trek, he-man, original TMNT series etc., as well as a lot of modern references (E.g., "Krang has just started on the diet known as Atkins. Krang has already lost 9 krang units of weight."). There is even one episode that pokes fun at the dungeon and dragons crowd. For kids, there is a lot of action and silly kid humor (Michaelangelo is particularly good for this). All in all it is just well done. Animation is great too.
That said, the last 5-6 episodes have been a bit off. I'm hoping the series returns too its roots a bit because the latest season has been iffy. Seasons 1 and 2 are great though.