Cedric said:
Ok, I've read several people expressing the same sentiment recently. I've never actually looked at the MMIV, what's the big deal?
MMIV broke the 'formula' in a lot of ways.
Firstly, it included pre-generated encounters and lairs for some of the monsters, which some people object to. They expect monster books to be about, well, monsters.
Secondly, it included the "Spawn of Tiamat", of which there were about 20. That's an awful lot of pages dedicated to beasties that are fairly niche items.
Thirdly, and probably most controversially, it included a lot of 'advanced' versions of monsters from the first MM, which basically amounted to Drow, Lizardfolk, Orcs and the like with a few class levels tacked on. I must say I initially hated that idea, but now feel that those pages are probably the best-used in the book. The new monsters strike me as mostly too oddball to see much use. Where the stats fall down, though, is that they have restricted themselves to low-level creatures (which are the easiest to homebrew), and restricted themselves to 'easy' advancements (I don't need a book to do a Drow Ninja 4 for me, thanks).
Between points 1 and 3, the new and expanded stat block and monster format, plus a relatively large text size, MMIV actually has very few new monsters. In fact the book has fewer monsters (and far fewer 'good' monsters IMO) than the 96-page softcover "Monsters of Faerun".