From Chainmail to D&D Next
This is the game that got me to play D20 again. I thought I’d never play D&D again, but this is the right mix of 3rd and 4th Edition, with the some narrative items tossed in. The comments on how the writers actually play are great.
The move away from miniatures and rules that support more abstract positioning are a huge plus. They really made how I prefer to play easy and still give enough of a tactical feel. I found that combat rarely went more than six rounds. I liked that a combination of class and weapon determined what damage die.
The way monsters are written up, with their special abilities triggering on certain to hit die roles, made them easy to GM in combat.
This is currently the edition I’d recommend to most people.