If the Wii was faster and had updated Flash it would have been pleasant. As it was it was adequate for showing my parents and in-laws certain things on the net. I don't have a 360, but hope to fix my PS3 and get a Wii U. Neither of which I have any plans for my parents or in-laws. They both have newer PCs than I now so that's not a problem other than them not being in the living room. Maybe one day we'll get a console that'll be able to be used as a living room display and gaming room system. In the mean time I expect PC to win in the media center unless the Wii U is more powerful, it's TV controls very expansive, and it's web browser to be up-to-date.
Some people still use IE?
IE is better than ever, but I still prefer Chrome for most of my projects and Firefox for my daughter.