Until GTA hits the Wii it hasn't been played on the console it was truly designed for.
Rockstar have not made the game the way it was meant to be played until they release a Wii version.
With the Wii-mote used as a stearing wheel for driving and perfect for all types of weapons GTA players are missing out on so much more depth.
As for GTA not suitable for Nintendo consoles, I don't think the mass general public would think anything like that of the Wii and GTA is now no worse for violence and other 'adult' contect than many other games out there on all consoles.
When the series was first released it was a 'media jumping on the bandwagon oh my god this is terrible game' but now its just an everyday bog standard game that is here today and gone tomorrow.