Played this for quite a few hours since Tuesday, and it's lining up fairly well with my expectations. I'm not very good at either Puyo Puyo or Tetris (at least not yet!), but I'm having a lot fun playing and getting better anyway. I've checked out a couple of the tutorial videos Sega put on their YouTube channel, but I'm going to try to learn by playing as much as possible, since I find that to be more fun.
I've also been pleasantly surprised by the story mode thus far. Between the aesthetic, the music, the writing and voice acting, and the story itself, it's got an awesome Saturday morning cartoon vibe which fits the game perfectly. Going by the completion percentage, it looks like there are 70 levels (and there are objectives in each one beyond the minimum to advance the story), so there seems to be a fair bit to it as well. I'm sure the multiplayer is still going to be the star for most people, and that's probably where I'll put most of my time with this game too, but the story mode might actually end up being my favorite part.