I stopped playing D3 once I got to the point I could fight in inferno, because instead of a 'flat' area to play around with your completed character it instead left you with only a gear grind to improve with. No new skills, no new stats, and no new rewards. Just bigger numbers.
0.4 is doing a few things I like. The paragon system lets me get new stats, the removal of rage timers and health refreshes from champions and rares prevents me from being stonewalled if I'm willing to try and brute force one pack, and the new legendary items mean I can find interesting items rather than just interesting numbers.
I think most people won't like the free max MF on paper, but I expect paragon 100 to be an insane grind and people with multiple characters will probably still need to work in MF to hit the cap and I really prefer the NV system to an item based system anyway.
I'll be going back to the game when that goes live.