Are you kidding me? I'm not big on realism in graphics, necessarily; for instance I loved Wind Waker. But the graphics in Twilight Princess blow Soul Calibur and the demo out of the water. They're more technically advanced, with more details and better effects and yes, bunches of unnecessary patterns. Those patterns make up what we call art direction, visual artistry, and it puts the demo to shame. The artistic direction in Twilight Princess is nothing short of incredible, something those other two lack severely.
You're blind or stupid if you think the two are basically the same. It has nothing to do with cartoonishness, either. The cartoonishness isn't intentional cartoonishness, but the result of inexperience with the technology and a rushed artistic approach.
I'm very much gameplay over graphics, but I might also point out that Twilight Princess is the only playable game of the three (one being a demo and another being CGI cutscene). You've got to appreciate the effort put into Twilight Princess over the other two (in art and technology). It's simply better. I'm hardly even considering this a matter of opinion.