Broadly speaking? Terrible. Not that there aren't exceptions, and I admit hit points specifically seem to be more appropriately matched with PC damage output than 2014 HP. But the monsters remain boring and simplistic -- except those that cast spells, in which case they are still a PITA because they won't just embed spell stats into the stat block.
A5E MM remains a much better monster book, and the ToV MM is at least a little better, too.
I get that some people really want the simple monster stat blocks, but I find it frustrating and boring. Make good monsters. they are the heart of the game.