Not pointing the finger at anyone here, but there's definitely a bandwagon... it's generally acceptable to hammer anything Microsoft does.
People just can't seem to get their head around the 'optional' metro interface. It's all about the bigger picture - the "3 screens" vision. MS want to bring a seamless experience across all devices - phone, tablet and PC. In order for this to happen, they all need to share the same kernel and, in the case of non-touch PC's: give users the option to install apps purchased/used on their phone and tablet, as well.
What makes me laugh is that MS would be slammed if they didn't offer the metro UI to non-touch PC users. Damned if you do - damned if you don't...