Eh, these aren't bad scores. They seem standard for a Platinum title, Metal Gear Rising got a 3/10 or two as well didn't it? And I'd probably say the camera in W101 is better than Rising's as well since it doesn't like to move on its own away from things you need to focus on.
Either way, I think most people who played the demo were expecting the drawing mechanic to be kinda polarizing. It works fine on its own, but when you try to do it quickly during battle it can get a bit iffy with complicated shapes. I mean something like a line, an L, or a squiggly line is no issue, but there are more complicated shapes than that. The controls besides the hit-or-miss drawing are as good as Bayonetta anyways. It's nice and responsive.