http://imgur.com/a/or3gN
This is what GX looks like. If I load up Alien Soldier, for example, in GX, it will stretch 4:3 to widescreen (looking terrible). This affects *all* games in GX. In vWii, games work just fine in 4:3.
On my kids' Wii, GX loads up properly in widescreen. No issues at all.