Well, the whole 'getting rid of extremes' is a statistically sound approach... if you use it properly. (Like everything in statistics.) However, the question here is what are the extremes of your data set. Right now, you have at least 70% of the people who have played the game saying it's very good, and the rest saying it's good to middling. (I cannot think of a single review I've seen that states that they won't play 4E come June.) Right now, this is showing a very good chance that the overall reaction is positive.
Now, should WotC look at what people are saying? Absolutely! However, they should look at the comments critically, in the same way that people should look at their system critically. Evaluate what a given person's concerns really are. Determine if those concerns are valid and whether or not they have already been addressed in the system. Etc. etc.
Re: 'appealing to the younger crowd'... well, I don't know exactly where I stand in relationship to most people here, but I'm 31 and have played D&D for at least 20 years. If you want to see a zero-sum approach where an item must suffer in one area to excel in another, that's fine.
The beginning of Dungeon Crawlin' Fools (first OotS compilation) springs vividly to mind: "Damn. Time to break out the +2 Shampoo."