I rather enjoyed it, and I'm exactly as bad at it as I am at Excitebike. So, I love the game, even though I'm horrible at it. The controls were tight, although I think I was shifting directions too fast sometimes and it seemed unresponsive, but after a few more runs, I got the hang of it. The physics are a bit different from Excitebike, but that's fine, as it was easy enough to get the hang of, and feels a bit more modern which is a good thing as it lowers the learning curve.
All in all, I don't think I'm ever going to complete this game 100%, but I'm certainly going to come back and play it a lot, because it's just so much fun. The best part is just watching the Knight bounce around after a miserable failure of a high-speed jump.
If I could play it with a gamepad, I'd probably love it even more.
4.5 stars because it's a great game, and only needs a very small amount of tightening in places. For example, make the "starting light sound" a bit more distinctive and/or louder.
That's all I got.