I have been playing it for the last little bit, I've actually really enjoyed it, it's a FUN game overall. HOWEVER! It's not a Paper mario game in the sense of 64 and TYD, which really stinks. :\ I didn't play sticker star for long, and I enjoyed SPM for the most part, but I absolutely love TTD and 64.
Color Splash is fun, the paint thing is actually pretty cool and fun to mess around with, but I get disappointed whenever I compare it to other PM games. They do levels instead of a more open world thing, the main hub town is decent, but there are only toads.. What happened to all the different characters you could interact with? The cards and battle system are alright, but I wish I could just find different hammers instead of having to use the cards, etc.
Also, every should checkout this awesome HD texture pack of TYD! It's not 100% complete, but it's basically there. You can come and help out to finish it if you'd like, or just download it and play it with Dolphin!
https://forums.dolphin-emu.org/Thread-paper-mario-ttyd-hd-texture-pack-v0-9-october-4-2016