As great as 4e was from a tactical skirmish game perspective (and I just completed DMing a 9 month campaign a few months ago - so the experience is fresh), it didn't do the best at presenting creatures in the context of a world or mythology - compared to the games of the TSR era.
Like, I used to be able to run a mystery adventure based around a doppelganger. In 4e, the shapechange ability was an encounter power that lasted one round. It's just another enemy that posed a moderately interesting tactical challenge for one round and did extra damage if it flanked you.
In 5E, they didn't go back to considering the creatures' role in the world, society, environments, etc (which was something I loved in the 2E MM - which I still think is the greatest of any edition). We had stat blocks, but not very well organized, balanced, or interesting.
I understand 5.24 is taking some steps to improve on my 5.14 complaints. Still, I have no interest to get it until if/when I'm actually going to run D&D again.