he's the highest among the AI in score and power in one of my current games, and has been for a long time. he had a pretty nice chunk of land to spread out on, that helped him i'm sure. he declared war once on somebody who was already at war, but it ended quickly and as far as i saw he never even sent troops to that continent. other than that he's been peaceful all the way through. the fact that he's quite ahead of the other AIs in tech is interesting, since his traits aren't geared towards sitting back and studying science. but he's done different beelines than they have, and he's traded with them. peter's even showing "+1 you have shared your technological discoveries with us" towards him, i don't think i've
ever seen that modifier from one AI to another.
in this game, spain was shaka's nearest neighbor and he'd hated her ever since i converted him to my true faith and away from her heathen babble. i was actually surprised that he went 5000+ years without ever DoWg her. so i'm getting ready to declare on her, i want her resources, and then he i see that he's changed to WHEOOHRN status (i check all the time on everybody, even gandhi, i'm paranoid). he was definitely not going after me, my guess was isabella. i started my war with her as soon as i could get there, probably 4 turns after he went WHEOOHRN, so that i'd get the prizes before he did. he didn't jump in and declare on her, but even when she down to one city, on an island far away from him, he was telling me WHEOOHRN. as soon as she was completely gone, his hands were free. as long as there was
any chance he could go try to beat her up tho, he was still getting ready *giggle*.
i've seen him do really well if he gets a good start, like Bh said. and i've seen screenshots/reports from other people's games where it looks like half the screen is zulu yellow

.
Shaka, in my games at least, is often at the bottom, however, if he ever starts to get on a roll conquering, he doesn't stop. I've had him at the top of the heap, but he never stays there.
that's what's quite odd about this game. he's on a roll but in a builder/teching sense. he hasn't conquered anybody, never even captured a single city the entire game! well maybe a barb city or two. and i don't have random personalities on, i checked *giggle*.