Only the developers should worry about power because that means they actually have to work and optimize a game for a system.
The consumer shouldn't worry about power.
The consumer should, however, be worried about whether a developer is able to produce fun games. As in, games with complex AI engines, interesting worlds to explore, sufficient online services, and yes, games that look good and sound good.
All these things combine to create a game experience.
And amusingly enough, all need power.
but seriously alot of the launch games will be nothing compared to what will come in the next couple of years. I would say we are only seeing 25% of its graphical power at the moment so time will eventually tell. When developers start getting into the swing of their kits and put forth some good controller integration and new gameplay ideas mixed with taking risks instead of pulling the old 'play it safe card' we might be pleasantly surprised 