When Valve was first leaking details about Steam for Mac, they released a series of images parodying ‘classic’ Apple ads. This was one:

I get what they’re trying to say – the PC is boxy and old-fashioned while the Mac is shiny and new. The unintentional humour is that while the Portal turret does it’s job adequately in its game, it’s easily defeated. The PC (or Team Fortress 2 turret) on the other hand starts out small and meek, but can be easily upgraded in to a massive powerhouse. That said, which would you rather have? Effective but locked down, or less-than-pretty but easily customizable?

Of course, I could just be reading too much in to things again.