I came back to this thread to say that, well, I've beaten the game today (had a complete playthrought with a friend of mine in his home), and... I know what reviewers are saying. I'm completely aware that it's not precisely being a critical acclaimed game (not that it should be imho), and that some people are going to absolutely hate it. But I had... fun. Don't know how to put it, but it was a solid and enjoyable adventure for me. We took some time in getting some S ranks (which are fairly easy to achieve) and unlock some new stuff. Though there was a one particular level that I really, really disliked (A 2D section near the end of the game), the rest of them was a fairly enjoyable and fun little adventure. I wouldn't completely say that it's a platformer more than an action game. So I guess that if people are expecting tricky, clever platforming this might not be the game for that. And, well, though I can see the game flaws, I had fun, so I can say I was pleased with the result. Heh, heretic thought, I think it's a better game than Mania, which is massively overrated imho. I'd probably rate it with a solid 7.5/10.
The trick is... don't expect going into the game to find some clever platforming, level design or plot. It's just pure, silly fun. I'd same the game core is bland, but, still, it's flashy enough and speedy enough to make it an enjoyable game and a fair successor to Generations.
I think this is one of the times when I feel alone into thinking this, but my opinion is grounded based on my few hours with the game, and I don't think it'd change. I'd probably replay it at my home one day.