You say that like it's an objective truth -- "a fix was in order." What if someone likes the DMG system? What if they want a low-magic campaign where the only items available are those in the DMG, and only at the outratgeous prices that are listed? Is such a person "refusing to believe that a fix was in order" or is such a person "not liking the fix and having fun without it?"
First, let me say that I
completely support your right to ban anything you want from your game.
Second, I prefer low-magic games myself, although Eberron has been a surprising (to me) exception.
Third, I think the pricing of some items in the MIC is
crazy. As I said up-thread, I've not had an issues with
belts of healing, but IMO there are a good number of items in the MIC that are too good for the cost.
That said, a game using DMG pricing isn't a low-magic game, and it's not "low-magic" that the MIC fixes (or purports to fix, whichever your perspective may be).
A game using the DMG is a normal-magic D&D game (which is to say, magic items are plentiful), but it's a normal-magic game dominated by stat-boosting items, save-boosting items, AC-boosting items, and so forth. (The Big Six.)
By contrast, a game using the MIC is a normal-magic D&D game with higher variety, because for 16,000 gp, you can purchase non-Big Six magic items with a utility in the ballpark of a +4 stat-boosting item (for instance).
I think, if you're going to play normal-magic D&D, that increased variety is definitely a good goal to have had in a supplement, even if the mark was missed in some cases.