After the somewhat disappointment that was Season 3 (it wasn't terrible, but too overly focused on nostalgia for my taste), this season feels like a big step in the right direction.
There are a lot of characters, but the longer runtimes help give us enough time with each of them that it doesn't seem bloated.
I was also confused by the $30 million-per-episode price tag, but you really do see the money on the screen. The scope, the cinematography, the sets, the incredible practical effects used to create Vecna, it's a feat for television.
I am waiting for baited breath for the last two episodes in a month.