Well, personally, I had quite a good time with Black and White. I won't say that there weren't a few parts that rubbed me the wrong way, but overall I had fun. I liked messing around and generally screwing with the populace of the various worlds. And it really does open up after the first world, just so y'all know...
Heh, I remember abusing the cross-world portals... I once ended up shoving so much junk in there that when I popped out on the other side, the entire surrounding area was covered in cows, grain, villagers, wood, trees, and other assorted detritus (I'd normally try and shove a toadstool or pile of poisoned grain in there as well... Damn, I was one nasty little blighter). Days later and there were still little hills of grain dotting the countryside.
I always ended up with schizophrenic creatures... They'd constantly stand around and talk/tell jokes to themselves. Fun to watch, but you start worrying about their mental health partway through...
And after I found out that items in prayer areas increased the amount generated, I stuffed tons of trees and stones into the area surrounding my temple. Ended up being quite the landscaper, with rows of trees and little stone circles... I'd even have people enchant artifacts specifically for the purpose of prayer decoration.
Ahh, and the joy of lighting rocks on fire... I remember the first time I did that, it was on the second island... Right next to the starting village there's this little cliff with a bunch of rocks at the bottom, sitting in a kind of indentation. I'd smash the rocks a bit so I got a good bed of "charcoal", and then just set the whole damn thing ablaze. It's amazing how long rocks will burn...
Since that pile would remain lit for ages, I'd just use that as my main source of projectiles. It was loads of fun watching the AI freak out at my homemade "meteors"... A burning rock would crash into a building, so they'd register a physical attack and put up an appropriate shield. Then the burning rock would set the building (and the villagers) on fire, so they'd register a spiritual attack. Up goes the spirit shield.
Of course, there's no way they could sustain two full-sized shields at the same time, so he'd drain all his power and both shields would drop. Time for another rock.
Yes, yes... Burning rocks, chemical warfare, stealing scaffolding from the AI... Lots of good times.
I also found out how to train any creature spell up to 100% using only a single expenditure of mana, and how to raise the dead (well, sort of... They were a little dodgy, to be perfectly honest).