Personally, not a fan.... however my 20-month old granddaughter gives this show great reviews!
She says she particularly likes the plot twists that always seem to include a good moral lesson about character as well as teaching her skills like colors, shapes, counting and an over-arching sense of goodness about the world. Well, too be fair, her mouth was full of organic gluten-free mac-n-cheese but I am pretty sure that's what she was saying!