AGREED. To me, it seems to be a fumbled placement. Harmless enough, there are far worse things, but it's one of the many things I am dejected about with the compromises involved with going retina. Getting rid of the eject button doesn't mean you need to start playing musical chairs with features and design elements.
The previous power button was nicely tucked away, was essentially invisible and had a nice feel to it. About the only thing this gains is that it's easier to access the power key when you are prying the clamshell open just long enough to power on in clamshell closed mode. And that's not a use case Apple seems to acknowledge (or they would make the power button accessible with the clamshell closed). If they wanted to replace the eject button with something to save on designing a new keyboard layout, how about F13?
Overall, it just seems like an unacceptably kludge move by Apple on their very high end notebook. People complaining about the valid criticism about this move should realize what you are defending. Apple certainly did not pass any savings on to you, or increase usability in any real way.
I use the eject button all the time to put the computer to sleep. Command option eject
In an ideal world the eject button (or whatever it should evolve into) would be far more useful. Eject and the retina power button are very rarely used, despite the prime real estate, compared to most other keys. So get rid of it everywhere (software/UI can handle ejecting volumes, trackpad click should power up) or keep it in and make it more useful. I would vote for making it a home button and allowing a long press to let me choose things to eject/connect to/disconnect from/disable using mouse or keyboard.