What a load of rubbish that is.
Well you did say be harsh.

No only joking. I've not gotten into the sudoku craze yet. (too much for my brain to deal with) but your site seems to be well set out. It isn't in your face with all sorts going on, which is good for a site where you want to just sit down relax and do the puzzles.
Also you have not just put up a sudoku and left people to do it. You have given some good hints and tips.
I am going to bookmark your site and have a go at done a sudoku soon.