Wii and its graphics

[SDBlu]

I was just wondering why the graphics on the Wii are so sub-par? I was really anxious about getting this system, until my brother in law brought his over to my house to play. The only connections are through A/V cables i think...Anyway, the game he was playing was a sonic the hedgehog game and it honestly looked horrible.

I don't claim to have the best tv out there or anything, but the Wii did not do it any justice. I was just wondering if the particular game graphics sucked or if every other game would be that way? Never-the-less I've played this system on other televisions with other games, and they didn't look all that bad. Just not up to par with the PS3 or X-Box...