Received my copy of the 5th Edition MM yesterday. Overall it’s a beautiful product. The artwork is, for the most part, very well done and the layout is easy on the eyes. The book includes a nice selection of standard D&D monsters, even some of the ‘oddball’ monsters from the Fiend Folio, such as the mighty Flumph.
However, most monster descriptions still take up an entire page, even the lowly Goblin, which seems like a lot of page space to cover a monster that will, in all likelihood, be dead in a few minutes. To be fair, the actual stat blocks are smaller than their 4E/Pathfinder counterparts, with fewer moving parts as well.
One nice thing, the description section is broken up into smaller sub-sections that are easier to find and digest. Also, for the most part, the ‘descriptive’ part won’t be needed during play, though it may provide inspiration when designing an adventure.
While the MM is an essential part of the game if you’re making the change to 5th Edition, if you’re happy with your current edition of choice you won’t find anything new in the MM to port over to your game.