I don't know why there is the perception that the Wii didn't sell many games. That's definitely not true, it had incredible first party game sales beyond Wii Sports, and it actually had good third party sales as well. Here is a list of 5 million+ sellers, including mega hits like Mario Kart which sold 36.8 million and New Super Mario Brothers which sold 29.9 million copies.

https://en.wikipedia.org/wiki/List_of_best-selling_video_gam...

Some third party sales data which shows it was ahead of the 360 and PS3, launch aligned:

http://kotaku.com/5034951/heres-that-wii-third-party-sales-p...