I DVR'ed it and didn't have a chance to watch it until tonight, so I didn't even read this thread until I had watched the whole thing.
What a juxtaposition of emotion at the end. Meredith and Derek getting "married" after all this time, Cristina actually being happy and willing to say "yes" to Owen, Alex and Izzie's happy realization that her memory is returning, and then BAM Izzie crashes and John Doe is George.
I had a feeling that there was going to be a big finale with Izzie. It's only been leading up to it all year.
And yes, her still standing on the elevator leaves it open to her being resuscitated next season. I was waiting for an ending with George like when Col. Blake died on M*A*S*H. I definitely wasn't expecting John Doe to be George, and I didn't make the connection between 007 and him until Meredith screamed.
Of course, it is a TV show so if you know anything about legal medical or military stuff or anything like that, you know that it's completely unrealistic.
They would not have just violated her DNR like that, no matter that Karev insisted or not; no matter that she was a resident there or not. And notice how her oncologist was no where to be found after the surgery? Also totally unrealistic. (And how many times can Cristina change her specialty anyway? Is it just dependent on the storyline of the season or what?
George would not have been deployed 24 hours after enlisting. First there's the ASVAP (vocational aptitude test) that everyone has to take no matter what, and the physical, and he would have to go through boot camp no matter how badly they need doctors over there. He would still have to learn all the basics of the Army. He may have been able to sign the paperwork that night, but he wouldn't be "deployed" even to boot camp that fast.
You can't take these shows too seriously or you won't enjoy them. Kinda like how MS is almost always a preliminary diagnosis or at least a possibility on House no matter what the symptoms. If I took that seriously, I would hate that show, but I watch it almost every week.