I use WiiFit to stay in shape which makes the Wii less of a toy than 360/PS3
I can also use it to store music and videos (SD card) and watch movies (streamed from my PC)
Brain Academy can keep your brain sharp and there are lots of games for mental stimulation like Zack & Wiki as well.
Again you fail to distinguish why the Wii is a toy moreso than any other gaming system. I guess PS2 was a toy by your defination too.
Edit: Where the Wii is different is that it's a pure Gaming System (or rather video entertainment system since WiiFit, Wii Music, Endless Ocean and others are not typical 'games') whereas the 360/PS3 try to also be multimedia entertainment systems since they play movies/music as well. Really they are all the same - video entertainment.