Lots of boring answers in this thread.
My taste cry out for more classes. There is no limit to the Fantasy archetypes in contemporary fiction. If you look at contemporary Urban Fantasy, High Fantasy, genre-blending Fantasies, and then look to the East with Animanga, Manwha, and then open up to different cultura expressions of myth, you can truly make classes and mechanics endlessly. The only restriction that ought exist is a core number of classes popular in Americana and the EU, and then have an endless outpouring of classes in campaign settings, big adventures, and supplements in the future.
Anyone who thinks that 4, 8, or 12 classes can constrain the vast number of magical and heroic ideas + the huge amount of mechanics 5E can handle has a shrunken view on the idea of Fantasy. I can't even make my favorite characters from contemporary Fantasy fiction in D&D as is, let alone from anything Animanga related. And for a game that clearly wants some of that pie, see the Monk, that's a failure of the classes.
This doesn't mean 5E is a failure, nor is the PHB. But to my standards, the goal D&D has cannot be met with 4, 8, or 12 classes. I do not want to play a game where I have to pretend like Barbarian and Fighter is a sensible division but Warlock and Witch isn't, or that Warden and Ranger isn't, or that Confessor and Cleric isn't. Fortunately, there is a huge amount of 3PP material to help me out, and of course I make my own materials, but that's an aside.