There's a lot of hate in here for this game. I can understand a lot of the complaints, but no offence, most of it is stuff you guys just need to get over. A lot of the old mechanics just wouldn't work the same in this game, it's been so long since the last real SSX and shit's changed.
Like any game, give it enough time and it will click. I had a problem with the carving at the start, but now I found it much less of an issue. Just keep an eye on what's in front of you at all times and plan a path. I do find the landings can throw you off your path sometimes, but that happened in old SSX too. Grinding is definitely too sticky though, there's an area on JT2 that's very narrow and it can be hard to not throw yourself onto the train tracks when going fast, there should maybe be a button that turns off the stickyness while held, perhaps?
I'm really enjoying the demo and I imagine once we start unlocking gear a lot of these control issues will become non-issues. Take some time and just learn the game, it's hard to try not play it like old SSX but once you get over that hurdle, it's pretty deep, fun and rewarding in my experience.