Look at the reference results - 22% faster.
You can get a Gigabyte 7970 with 1100 MHz core for $450 btw (and 4 free games) - http://www.newegg.com/Product/Product.aspx?Item=N82E16814125439
So now we're back to 20-25% faster for $200 more and what, 3 free games less (does it even come with Metro?).
The OCed 780s are the same price as the non-OCed ones (well - $10 difference). Honestly, you would be a bit of a chump to buy one of the non-OCed 780s right now. Hence, it is perfectly fair to compare to the OCed cards rather than the reference card. At the resolution he mentiones, you are looking at 1/.73 or a ~37% speed increase over a 7970 GHz edition.
The games are another argument. Personally, I have never previously and never will buy a video card for bundled games. In 2 years when the games have gotten bigger and better, that 37% increase seems a lot more impressive than a couple of free games.
However, I know many people who would be swayed by the free games. They don't buy a lot of computer games so $200 and 4 free games will last them for 2 years.
Just for complete disclosure - I am probably not the intended market for this card. I have a 570 that I've been wanting to upgrade, but spend most of my time doing compute now rather than gaming as I mentioned earlier in this thread. That compute is tied to CUDA because of work. So I waited for the 780 to see if it would be a cheaper card than the Titan that I could practice CUDA on at home. The FP performance difference is a pretty big deal for me. Makes it a tough decision.