Quickie thoughts:
Overlord is a ton of fun. The "feel" is dead on. The game has tons and tons of character, it reminds me of a lot of older English games (Simon the Sorcerer!). I'm not too far in yet but I wish it were slightly less linear. The "Quest" structure makes it seem like you'll be able to pursue goals at your leisure, but so far quests seem only to appear when they're ready to be completed, making it pointless altogether. I also wish the controls were slightly tighter. "Sweeping" over a wide space often turns my horde from a tightly knit gang of bloodthirsty dervishes into a scattered, easily killable gang of nitwit Gremlins. I suppose in some ways it's supposed to mimic the difficulty of commanding that many morons at once, but frequently it comes off as sloppy and loose.
Crackdown is fun. I wish there was more to it. That is all.