My kids LOVE Dino Dana (S1 and S2) and Dino Dan.
They don't like this season. I think the weird, usually extravagant costumes are kind of creepy to kids. (Hatching from eggs and dressed like creepy 80's sitcom dinosaurs, you know.) I think the budget was just cut and they had to resort to less animation, therefore resulting in costumed actors.
In previous seasons there was always an easy to make connection to the imaginary world of Dana. This season stretches that a bit and goes the forlorn way of Gilligan's Island. In Gilligan's Island they ran out of ideas, so they had large portions of their later episodes "daydreamed." Dino Dana has taken that route, where instead of just imagining things as she goes about her daily life, she "daydreams" dinos into her world with weird scenarios (police officers, etc).
It's forced and isn't as interesting to my kids.
They'll watch it, but they want the older episodes.