1. Pretenders to the Throne: Best mission of the campaign. Gone are the silly monsters and bosses, fight heroes and kill them soon before they become a threat to you. With heroes defending their home getting crushed, and some improved Kingdom AI (Them being allowed to set flags and build some more) this could be a classic. Still; in it's current form it's pretty nice. Just needs the flickering UI fixed.
2. The Demon Advisor: Allows you to build up your base pretty peacefully (unlike, say, Skeleton King or Mortal Foil), yet in an interesting enviroment with improvingly difficult foes. Maybe a bit too much on the easy side for the final-last mission (clean map on day 60 is pretty much a given, then rushing the Advisor. Sure, THAT guy is tough, but not more than the Ancient Lich).
3. Dangerous Valleys: Constant action, but not too difficult so a lot of fun defending against.
LEAST favorite maps:
1. Gold of Chyort: Few heroes needed, insane short gametime and required rushing. BORING. Give me a 100 day game over this anytime.
2. Trouble with the Afterlife: That darned Lich! While the map certainly is interesting, the battle with the Lich is just frustrating. My least favorite "Boss-fight".