My opinion
Here is my opinion for 4th Edition so take it for what it is worth.
I have read through the books, but have not played it.
It is geared towards selling minis and having people play "roles" in the group i.e. tank, commander, artillery etc.
It seems like you can only play your role as defined by Wizards. You can't be the commander/leader of the group and the wizard/artillery. It is one or the other. Like I said, I haven't played so there may be ways to work this out.
Honestly, when I was reading through it all it reminded me of playing guantlet on the PS2.
I am a big fan of flexibility and have mentioned before that I am leaning towards a point buy system that lets players decide whether they want to spend all of their points to have 2nd level wizard spells at 2nd level with only 1d4 hit points or to take the normal progression path.
I am greatly disappointed with 4th edition. When 3rd edition came out I had hundreds of character ideas with that system. With 4th edition, I have none. I don't know how I would convert any of my 3rd edition characters and I am not interested in playing 4th edition at all.