If my memory is correct, the entire Peppa Pig[1] TV Series was done in Flash. Many other popular TV series were done entirely in Flash. A good friend and fellow Flash champion, Chris Georgenes[2], did quite a lot of good animations during the early days of Flash.
This show is a masterclass in animation, I have to say. Everything is built out of essential geometric shapes, yet has an incredibly strong character. Brilliant stuff.
I think it looks kind of terrible to be honest. I'm not surprised at all it's made with flash. It looks like the sort of thing a talentless non-artist who can only make basic shapes like me could manage.
Peppa Pig is much better animated IMO. Or should I say much better drawn. It doesn't have much animation either but the people that do the drawing are clearly better artists.
1. https://en.wikipedia.org/wiki/Peppa_Pig
2. https://www.youtube.com/user/chrisgeorgenes