
Meguel is Meguel. He likes the stuff from Microsoft and he is a big fan of the stuff they do right. He is also a lover of Open Source/Free software and all that. His first move in his carreer was to apply for a position in the Internet Explorer development staff. Tried to convince them to open it, even. But couldn't get the visa to program in the USA.
So combine those two features (love of open source and admiration of Microsoft) and you get things like Gnome and Mono.
Which isn't bad. Gnome, dispite all the KDE fanbois's objections, is the standard Linux desktop environment. It's the most stable one and provides the most advantages to both software open source developers and proprietary ISVs. It provides the most usable desktop and is the simpliest for new users to use.
Mono is fine also. I prefer to have a combination of Python and C, were appropriate, but whatever. It's personal taste.
All the MS hate isn't doing anybody's any favors. They are not satan incarnate nor are they any worse then Adobe, Apple, Oracle, or any other company that makes almost all their money off of proprietary software. If you have any doubts who is the bigger asshole google for "apple sues". For every one Microsoft sues lawsuit you'll find at least 3 for Apple.
In the case of Silverlight it's a open format and documented. Microsoft encourages Moonlight, even going as far as to license codecs for Moonlight users to use.
Meanwhile Adobe flash is still proprietary shit with a 2 half-working open source attempts at compatibility.
If given a choice between Adobe's closed source undocumented crap and Microsoft's documented crap with a decent open source version.. I'll take silverlight every time.