I actually didn't think he was that good. The arrangements just didn't sound that good to me and the songs didn't transition that smoothly.
Most of the them were separate songs back to back, so the transitions weren't necessarily going to be smooth.
I didn't think he was a good player and that got in the way of me listening to it...
I agree that he's not the most skilled player around, but the fact he went out and did this I think is a great thing. Can't we put the inner Simon Cowell in us aside for a second to say "Hey, someone is trying to promote Pixel's music and also tribute Cave Story in their own way. That's great!" And if you really think he was that bad, then upload your own video showing how it should be done.
...like I am. Eventually. When I have time. <_<