Well, I am a big Xbox 360 fan but at the same time I personally can't ignore that the Wii has made quite an impact on gaming as well. In fact, if you look at that same "best of the decade list" the Wii remote is on there too.
Anyway, where Nintendo does disappoint however is the fact that for the past 1-2 years they have made EXTREMELY weak software to go along with the Wii as opposed to Microsoft and Sony who both have had extremely strong line ups.