I mean, I initially hated 4e, and I have no problems saying so. The game, as presented by the initial three books, just didn't "wow" me. It didn't seem to do much that would make me want to switch from 3.5. With 3.5, I could create any kind of character, monster, NPC, magic item, whatever, I needed to, out of a vast sea of modular components.
I had a ton of 3.5 books, work I'd done on my home games, custom races- heck, 3.5 let me play a MONSTER! How cool is that? What did 4e have to offer?
Encounter based powers? Yeah, uh, most of the melee were playing classes out of The Tome of Battle in my game. If you wanted, you can be a Dragonfire Adept or Warlock. Maybe the Warlock needed a little fixing, I was down with that.
But a few years into the game, I tried it again, and that's when it clicked. I could now appreciate what the game was trying to do, and there were now tons of neat options to play with. And the more I played, the more I wanted to play.
My problem with 5e is it's slower development cycle. I played it. I ran it. I said "you know, there's a lot of things I'd like to see that just aren't here. Well, maybe it's time to take a break."
Then you come back after a few years and....not much has changed! One or two new books drop that offer new options or change how things work, and that's interesting, but the things you thought should have been addressed by now...haven't been.
And it's not just rules or player options. Where is the rest of the Forgotten Realms? Don't worry about that, we're going to move on to other campaign settings!
Where's the DMG2? Or other DM facing content to help you run the game better? Where's my Sandstorm or Dungeonscape?
Nowhere to be seen. And why?
Because the number of DM's is too small a percentage of the player base to justify making a book for them?
For the edition that supposedly empowers the DM, I don't feel especially supported.