You'll be surprised when the difference in graphical power is nowhere near as big as the graphical power difference this gen, if even noticeable at all.
The key thing to point out is that the console launches in around 6 months; and that none of the games shown there are in their final build. Expect the quality of graphics and the slickness of the controls to improve greatly in that time; and remember that these are indeed early titles.
Judging from rumoured specs, the Wii will be about 2-3x as powerful as this gen, depending on how its optimised and how the devs actually extract said power. In addition, the rumoured PS4/720 specs apper to be 2-4x more powerful than this gen, so the difference in power overall is slight.
Bottom line is; the gens are defined by controls, not power, nowadays. That's the fact of the matter. It's the games that count, not the graphics. The most important thing is that Nintendo are close enough this gen to have some quality 3rd party support, as porting down will not occur, and the CCP shown is an easy change from the other consoles. And if you expect 1080p 60FPS games next gen; then good luck forking out $550/£450 to do so.
Oh, and the HDD issue? "Grow up". It makes the system smaller. 8GB will be enough for 90-95% of the people who buy the system; only people who download tons of games will need anymore, in which case plug in that HDD you'll have lying around no doubt, or get a 16GB SD card for less than £10. No way is the HDD 'next-gen'.
