The problem is:
People's attention spans. I've read the reviews and I felt the same way...AT FIRST. I was just about to exit out when it started getting really fast and you had to plan your movements in advance, not unlike DDR or Guitar Hero, really. This little animations were pretty hilarious, overall this is a great G&W clone. I would love to see this same mechanic, but maybe with a total animation/art overhaul with powerups and stuff. Who knows?
Bottom line: Give it some time people, and always remember on Newgrounds, just because you don't LIKE a game doesn't make it bad :D