Dragonblade
Adventurer
Yes, I totally get why the player side of 4e's mechanics didn't resonate with many, but as an old time gamer (I started with Basic and AD&D decades ago), 4e monster design was great!I noped out of 4E after reading the PHB, but the more I hear about 4E's bloodied condition, the more I like it. I would definitely be interested in a 5E monster book with 4E design theory behind it. (Not so much the aesthetics, though, as that's part of what turned me off about 4E.)
Combat was always tactically interesting, and as an old school improv style DM, it made running off the cuff, improvisational encounters sooo much easier to run and manage without needing to do any prep ahead of time.