The Wii is a popular system.
The Wii is a money-making system for Nintendo.
The Wii is the least expensive (in a full-featured model) of the current gen consoles.
As an owner of all three current-gen systems and a self proclaimed "favorite-agnostic" console enthusiast, do I consider it to be the overall "best" current-gen system?
No.
Between it's online model, DLC, price point, and software library, I think that the 360 is currently on the top of heap as the "best" buy for somebody looking for a gaming console.
Would I recommend the Wii to a consumer who had yet to buy any of the 3 current-gen systems as their first and/or primary system for this generation?
No.
If the household only consists of youngsters (under 10) and adults who haven't maintained a gaming "hobby" for the past 10+ years, Wii could fit the bill. BUT I'd really have to wrestle with the concept of recommendation beyond that, as once you step outside the realm of Nintendo's 1st party titles and the AAA DLC offerings, you're awash in a sea of shovelware garbage.
I do think that the Wii is Nintendo's best system since the original NES, BUT, IMO it's runaway popularity and success has more to do with things that don't directly correlate to a quality GAMING EXPERIENCE (and that should be the most important thing right?)
Wii is good, Wii is great, but its success in the market is not all that it appears to be and does not project a positive future for big-budget, deep, intellectual games in the mainstream marketplace.