Main excitement with Mario Maker for me is Tom Hall involvement with this editor. Not sure about other users made content, but I'd love to play his puzzle-like stages. I have yet to buy it for my small collection, though.
Considering Yoshi, it's funny because I had exactly the same prejudice as you about Wooly World in particular (knitted world? what?) and Yoshi's series as a whole (I've never played previous entries to say). Up until I decided to buy it for my girlfriend to play some relaxing co-op with her, seeing she's not much of a hardcore gamer. To my surprise it was pretty tight even for me and actually hard to beat with 100% collectibles found. Some of hidden unlocked stages were a real challenge to what you've already learned through out the game, they were so hard that they needed a lot of die-hard attempts to finally make it to the goal. With that, all of it was wrapped up in some cute childish game as I initially thought from the start. My advice find yourself a friend to play with and get this game. Don't get scared off by aesthetics or implied easiness. I got it for $34 or near that and I think it's worth it.