WordPress is still a predominantly English bloghosting. It is used all over the world and is quite popular thanks to great design, cool team, special "chosen" vibes (often) and many other reasons. But it is still quite non-friendly to non-English users.
LiveJournal and Blogger, for example, open in an all-Russian interface (i.e. when you type http://www.livejournal.com in the address bar the page opens in Russian automatically), while in WP even if you choose other-than-English language as your primary one, most things would still be written in English, plus after you go away and return the settings will be again turned to English ones.
Maybe WP team can consider taking a more open approach to its main and other pages (I do not mean translating the Forums, for example) and make them available in other languages. This could be a possible way to increase non-English fanbase.
As for WP engine (when you have blogs without wordpress.com in the blog address) it is more popular among Russian bloggers than WP.com accounts. The latter is very few in number. WP is still familiar only to enthusiasts and computer geeks, but then they all have standalone blogs based on WP engine.
I don't have a slightest problem using WP with its present English interface, but I think that more people could come and join us from my country if WP had pages entirely in Russian (and other languages).