I didn't say WP is the best for EVERYTHING, but it's certainly the only tool that allows you to do EVERYTHING. Mediacore is amazing.... if you have a team of developers OR lots of money to spend OR lots of time. Plus, you'll need very specialized servers AND/OR really tech savvy server support. In my experience, at least 90% of server support people doesn't even know how to turn on a computer, let alone install packages, so we're off to a horrible start. This, opposed to the 5 minutes (well, let's make it 30 seconds) WP install. Then, our script handles ANY extension, while Mediacore only allows FLV and HTML5.
And when you realize the once "FREE" script in fact is EXTREMELY EXPENSIVE you'll simply run away from it and cry over the time and money you wasted blaming yourself for not using WP
Now, I know you're nitpicking for the sake of argument, but seriously, there's not even a comparison.