(Wife): SEASONS 1-3 USED TO BE INCLUDED WITH PRIME MEMBERSHIP. THAT'S WHY WE PAID FOR SEASON 4. NOW WE CANNOT WATCH SEASON 3 AND MAY NOT BE ABLE TO WATCH SEASON 2. THAT IS VERY ANNOYING.
This wouldn't be such a big deal, except that Amazon only has a few shows that actually appeal to our daughter, and Dora the Explorer is one of them. I'm used to Disney pulling streaming content and charging high prices for their movies and such, but now Nickelodeon? Wow. I now have less respect for Viacom / Nickelodeon because of this.
But then, I suppose it's a good thing we are now spending more time reading books than watching TV.
Anyway, as for the show: it's a cute preschooler's show that helped our daughter start to speak in both English and Spanish. It's VERY predictable, VERY based on routines -- but that's just what pre-K kids need.
With regards to other shows on Amazon video, our daughter's other favorites have been Tom the Tow Truck and related Car City series (Tom the Tow Truck's Paint Shop, Construction Squad, Car Patrol and Super Truck) as well as Super Wings. We tried watching Tumble Leaf. It was all-right, but it doesn't seem to be a favorite. The Thomas the Train series may still be included with Prime membership. It's just that I personally have ideological objections to that series (somewhat progressive values vs. the series' more traditional values regarding societal roles).
I wish you guys luck in figuring out what works best for you. Dora worked somewhat for us, but the episodes went quick for our needs. Same with Super Wings and definitely Tom the Tow Truck, etc.