MPG is not hesitant at all to criticize Apple, which he has for soldering in the RAM, but on the quad-core vs. dual core he says this:
http://macperformanceguide.com/blog/2014/20141016_1128-MacMini-with-Thunderbol2.html
So because some guy with a website imagines most people just use their computers for web surfing, nobody needs a real computer anymore?
And even standing on that jenga-tower of bad guesses, the best he can say is the crippled machine can perform well. So even still he won't go so far as to say as well as a quad core.