I say if you want a pure blog, then Wordpress is a good way to go. But if you want something custom-designed, want something unique, and are willing to spend a good bit of time learning, then MODx is for you.
Seriously, spending 10 hours learning MODx now will save you 20 hours later on when you want to customize the look of your Wordpress.
2. There are a few different ways to create multi-language sites.
3. I believe MODx is one of the easiest platforms for my clients to use. (And once you get into MODx, you can make it even easier)
4. The modules you see are not the same as Mambo/Joomla modules. But there is a list of addons here:
http://modxcms.com/resources.html
Starting point-
1. Setup MODx on localhost with all default settings
(a) Create another localhost install of MODx with no content
2. Add some content to the second install
(a) Learn how to use Wayfinder (the menu builder addon)
(b) Learn how to use the basics of Ditto (then take a break)
(c) Learn how to create a Contact Form with eForm addon (then learn some more stuff about Ditto)
If you learn how to use those three addons in that order (Wayfinder, Ditto, eForm, and Ditto), then you’ll be able to crank out some simple sites in no-time.
*The reason I said create a default install and a blank install. I’ve found it’s easier to learn MODx by breaking down each little item (Wayfinder, or a chunk) and learning it through doing it.