You need to see it as part of a whole. Active fluid combat is very good. Knowing exactly your bonuses and quick calculations and something to aspire too is also very good.
With this change you are marginalising the upper end of the melee spectrum in many ways. My focus is the AC issue because to me I enjoy the maximising of defense and being able to stand alone in melee without babysitting or if I feel like it going off to solo something without the need to be a blue bar caster. Others like that they will only miss on a 1 since they have max geared for this vs many other types. Now we are told we are OP in this, and that with diminishing returns there is LESS desire to make our toons the best they can be in an area. Getting hit 25% of the time on a max defense build? No thanks. Missing alot on a max dps build? No thanks. Before you would watch your gear and swap around as needed, oh I have IH so I am dropping out of CE to PA or I need to swap in high to hit gear or destruction for certain bosses/mobs. Now the focus is on mediocrity as the middle ground can be achieved easy enough by all and with little separating middle from the top there seems little point for those who got a sense of achievement from what they were building.
All the effort with ED etc which is fantastic has just been erroded by the lack of response in the one area you had to get right. You have seen people concerns, there was supposed to be a lets talk AC thread, the one area people have been after forever, so many viable suggestions made and ignored.
I know it is late in the day but consider the things people have been saying and give us the curtosy you have shown to casters.