First, let me say that I have played 4e since its release.
The biggest problem with 4e is that you need to play it "their way". By that I mean, WotC has deemed how D&D should be played. There is very little wiggle room for a DM to suit things to his style - which unfortunately - prevents easy house rule additions or changes. I've recognized this as a major drawback to the system and at some point I can see this driving some players away from the edition, or at the very least, not make it the sole edition they play. There is simply too much work for a DM or players to do if they want to have any significant house rules that it really isn't worth the effort. Instead, I see a lot of people complementing 4e with previous editions to get their fix for house rules.
The biggest problem with 4e is that you need to play it "their way". By that I mean, WotC has deemed how D&D should be played. There is very little wiggle room for a DM to suit things to his style - which unfortunately - prevents easy house rule additions or changes. I've recognized this as a major drawback to the system and at some point I can see this driving some players away from the edition, or at the very least, not make it the sole edition they play. There is simply too much work for a DM or players to do if they want to have any significant house rules that it really isn't worth the effort. Instead, I see a lot of people complementing 4e with previous editions to get their fix for house rules.