I think this questions deserves a long-winded answer! 
i have had many groups from office and elsewhere come to my place for 'gaming and booze' sessions.
typically, i hook up my gaming systems to my sony cineza projector, set at around 80 inches screensize. that is huge for the small room that i have, but without being taxing on the eyes.
typically, i start off my friends with the xbox 360 and play stuff like gears of war and halo. the reaction is "wow".
then i switch them over to ps3 and games like killzone, msg4, cod modern warfare, gt5 prologue... and the typical reaction is "wow, wow, what amazing looks!"
then i finally switch them to the wii and throw games like wii sports, wario smooth moves, various mario games, excite truck, etc etc... and the reaction is almost universal - "wow, wow, wow, wow". these folks have no intention of going back to the ps3 or xbox 360. i think nintendo hit a goldmine with the wiimote. i recently pick up the wii motion plus accessory and wii resort works beautifully with it.
so to answer your question, most of my guests go gaga over the wii.
personally, however, that wiimote gimmick gets tiring after a few months. my favourite console would be the ps3, simply because it plays blu-ray, acts as a media streamer, and you can install a linux distro. i have put ubuntu 9.04 on it, and actually use the ps3 as a computer. plus the specs on the ps3 are far better than the 360.
the only downside is the amount you will be spending on buying games. with the xbox and wii, well, you can always mod them and, cough cough, download 'backups'.
ultimately, it comes down to your 'mood'. For simple 'timepass' gaming, nothing beats the wii. for a console with huge games library, nothing beats the xbox 360. and for great graphics and sound, nothing comes close to the ps3.
i solved this issue by buying all three!

i have had many groups from office and elsewhere come to my place for 'gaming and booze' sessions.
typically, i hook up my gaming systems to my sony cineza projector, set at around 80 inches screensize. that is huge for the small room that i have, but without being taxing on the eyes.
typically, i start off my friends with the xbox 360 and play stuff like gears of war and halo. the reaction is "wow".
then i switch them over to ps3 and games like killzone, msg4, cod modern warfare, gt5 prologue... and the typical reaction is "wow, wow, what amazing looks!"
then i finally switch them to the wii and throw games like wii sports, wario smooth moves, various mario games, excite truck, etc etc... and the reaction is almost universal - "wow, wow, wow, wow". these folks have no intention of going back to the ps3 or xbox 360. i think nintendo hit a goldmine with the wiimote. i recently pick up the wii motion plus accessory and wii resort works beautifully with it.
so to answer your question, most of my guests go gaga over the wii.
personally, however, that wiimote gimmick gets tiring after a few months. my favourite console would be the ps3, simply because it plays blu-ray, acts as a media streamer, and you can install a linux distro. i have put ubuntu 9.04 on it, and actually use the ps3 as a computer. plus the specs on the ps3 are far better than the 360.
the only downside is the amount you will be spending on buying games. with the xbox and wii, well, you can always mod them and, cough cough, download 'backups'.
ultimately, it comes down to your 'mood'. For simple 'timepass' gaming, nothing beats the wii. for a console with huge games library, nothing beats the xbox 360. and for great graphics and sound, nothing comes close to the ps3.
i solved this issue by buying all three!

An aside from the main subject of discussion.
Krumbs - the PS3, XBOX 360 and the Wii, which one do you like the best? Or is it horses for courses?