Until I see Zelda, Mario, and Metroid games on a Microsoft or Sony console, I have to vehemently, vehemently disagree that the Wii should get the Sony defining 3rd party titles from the PS1 and PS2 eras.
Without the 3rd party support, Sony would not be where it is at today. Henceforth, 3rd party titles for Sony during the PS1 and PS2 eras = 1st party Nintendo games. In terms of impact for the long standing success and survival for the console.
So, hellz noes if the 3rd party games were Sony or Xbox exclusives! If you give something you sure as hell better get something in return.
Metal Gear Solid, Metal Gear Solid 2, Metal Gear Solid 3, Final Fantasy 7-10, and GTA 3-San Andreas were all Sony console exclusives. A few of these were released for the PC, but the PC doesn't count as much as Nintendo in this debate because it has been dead ever since the World of Warcraft strangled everything else and left the PC as a home for console ports and the occasional great PC exclusives such as The Witcher and Starcraft 2.
As for multiplats, I could care less and wouldn't even notice.
