Western games tend to be really ugly. A lot of them try too hard to be realistic, but it ends falling into the uncanny valley or something like it.
The layer of abstraction and stylization that many Japanese games utilize has the counterintuitive result of making the world qnd characters more believable and easier to immerse yourself in.
Also, I'm a sucker for serious, grounded topics being presented in extraordinary and fantastic ways. Like tackling depression and the tribulations of interpersonal relations in a cartoon about giant robots killing giant monsters.
Also, how many noteworthy Western game composers are there? I thought about making a thread for this, but it seems appropriate here. The JP games industry has a number of legendary composers, but I can't think of any Western equivalents.
There are a lot of excellent western composers - Tim Follin, Spencer Nilsen, Chris Hulsebeck, David Whittaker, Jake Kaufmann, Jeremy Soule to name a few - the thing is a lot of them were mostly active in the retro European computer scene, which doesn't get discussed nearly as much as retro consoles do. Best music in western games is of course found in indies, too.
Yeah, don't kid yourself. For most of these people it's boobs. See the amount of bitching about "censorship" that happens when a character is even slightly covered up.
Yup, there's about 9 pages on other reasons than boobs why people prefer Japanese games. And since when are western games off the hook for that? The most popular female character out of the west is Lara Croft for chrissakes!