Only one scene, and Hamlet is talking to Horatio in that scene, not the skull.

Ah, right. I knew that someplace in the back of my mind but I've had a lot going on lately. Plus I only think I knew of it from second-hand references in other pieces of media.

Shakespeare actually does straight-up tell the audience moments a lot, though. But you see, it isn't called bad writing when he does it, it's called "soliloquy".

Well I think it's also a little more difficult to judge live theater by the same metrics too. "Show don't tell" is a lot more challenging when you have to do everything on the fly. No second takes, no editing, the audience can't rewind bits they weren't paying attention to, etc. Just the live performance itself and everything the audience is able to hear and see.

Even so, it's fair criticism. Just because something is considered a classic doesn't mean it isn't without at least some drawbacks or flaws.