I have basically liked all the D&Ds, so I'm a little biased. I even liked 4e, although I recognize that it was a very different kind of game in a lot of ways from the others.
But basically, if you liked D&D pre-4e, and hated 4e, 5e may be what you were looking for. It's a much cleaner system than 3e/3.5e/PF; simpler and clearer. It's not as complicated in some ways. It doesn't have nearly as much detail in the rules, it doesn't have as many formal definitions. But it's clearer and easier to read. And before you dismiss "easier to read" as unimportant, consider: I spent about 10 years on an ISO language standards committee. I assure you, I'm not afraid of formal language. But I like 5e's system better.
Most of the bonus stacking rules are gone, replaced by a mechanic called "advantage/disadvantage". If you have advantage or disadvantage on a roll, you roll 2d20 and take the higher or lower respectively. If you have neither or both, you roll normally. Most things that used to be +2-+4 bonuses of various types are now "advantage", and most things that used to be penalties are now "disadvantage". In practice, you get similar results with a lot less addition, and without having to check the bonus types of 8 different modifiers to figure out which ones stack.
Everyone I know who's played it has been really happy with it so far. The system is much less focused on trying to resolve every possible question; instead, the assumption is that the DM is not an idiot and is not playing maliciously. If you tend towards adversarial player/DM relationships, avoid 5e; it's not designed for that, and it would be horrible. But if you are playing with people who are basically clear on the idea that games are meant to be fun, and who can cooperate without epic rules battles, this is probably the best D&D ever.
The anon coward's "MMO Crap" comment is well past "baseless" into "completely incoherent". 4e had a few traits that sort of, if you squinted just right, looked like it was MMO-oriented, but mostly it was more like wargames than like any MMO I've ever seen. 5e is pretty much like a cross between 3e and Rules Cyclopedia D&D, with a much cleaner and simpler rules set, and a lot more interesting flavor to things.
Lots of the "missing" complexity is rumored to be in the DMG as optional rules.
Casters as a whole are significantly nerfed compared to 3e, or for that matter compared to any previous edition. (Max-level caster? You get a ninth level spell per day. Use it carefully.)
There's some really crazy Internet drama about some of the consultants, which is best ignored, and has no basis in reality.