Naoki Yoshida interview @Gamescom

[Zojha]

Accessibility is a great thing. But though I prefer depth which implies interesting systems with complexity. The farther you go into complexity, the harder it is to make content globally successful.

Moreover, complexity does not equal depth.
Fun little article on that note: http://www.gamasutra.com/blogs/DanFe...y_vs_Depth.php

There are probably many more, but it gets the point across nicely. Personally, I like depth, but I prefer my depth as simple as possible. It's quite unfortunate that you can't really create depth without some kind of complexity, but...yeah.