I am grateful for all the replies. Though I am not really concerned about the benifits and mechanics behind the new MM. What concerns me is the changing of a game rule/power in an established game for no stated reason other than they want to change the way the game "feels".
I don't by into the concept that the current designers care about "classic" D&D. 4e is so far beyond the previous editions, and plays so differently, that any claim of a desire to see the game play in a "classic" way just rings false to me. I don't want to start a essentials is 4.5 argument, though I think that people who said the change may have something to do with essentials may be on to something. I am going to take WoTC at their word, and assume that there was no mechanical reason for changing MM.
For me, changing the rules two years after publishing just to provide a different "feel" to the game is a violation of the trust that I have in the designers. I expect a game to continue to be updated, and changes to be made to fix problems in the game mechanics that are having an effect on game play. This far into 4e, I am invested in the way the game plays, and have expectations on how the rules are going to work together. My understanding of the rules of the game and how they flow get turned about when something changes for no mechanical reason. My expectations, and ability to spot a rule or a mechanic that may be "broken" gets twisted about when the designers are striving to change the feel of an established game instead of making the mechanics work as best they can.
I am a guy who will buy a product because of the designers, not just because of the product brand. I'll support some designers just like I'll suppurt a music artist. I know their work, they have built a trust in me toward their work. WotC has broken some of that trust by changing a rule "just because". If they do it once, they will do it again. So, it isn't about MM, its about why WotC decides to make a change, and if it is acceptable to the people that support their efforts.