As much as I love 4e, even now that the ability to go back and play it is once again viable (where it wasn't, even with just books, for a long time, due to the lost online content like the Class Acts articles and other patches), I probably wouldn't now.
The reason being, as much fun as I had with it, I fully recognize the system had flaws and warts, and needed to bake for a few more years. Some elements were added that simply felt like power creep (I'm looking at you, Themes!) and others fell by the wayside (Rituals), or worse, were introduced and never fully fleshed out (the Martial "rituals", I can't recall what they were called).
What's really needed is a 4.5 edition that isn't Essentials (so, 4.75, I guess?), and that's certainly more work than I'm willing to put in. But hopefully, one day a game will drop into my lap and I'll say to myself "By Crom, it's 4e but better!". I tried 13th Age, but it proved to be a bad fit for my play groups.
And maybe I'll be able to talk people into playing it, lol.