Whether or not tradition is important depends on what the tier wants. If one chooses to tie in a manner faithful to tradition, that's the standard by which their flies should be judged. If, on the other hand, one chooses to innovate, that's fine too.
As far as the critique of CDG's flies go, he did, after all, ask for feedback.
When I give people feedback I generally start by saying that I'm going to try to critique their fly the same way I would one of my own. I say things like "I prefer..." , "You might try...", or "If you're trying to achieve classic proportions...". I always make sure to find some positive comments as well as suggesting improvements.
We're not all equally experienced or gifted as tiers, and, at the end of the day, we do this for our own pleasure.