Games with high sales have more of the qualities which appeal to a lot of people. Games which have a lot of qualities which appeal to a lot of people are much higher quality than those which don't. A game which doesn't appeal to you doesn't have a lot of qualities which appeal to you but may have a lot of qualities which appeal to other people. So in a personal sense a game can have few good qualities whilst overall have a lot of qualities which appeal to a lot of other people.
In short, just because it appeals or doesn't appeal to the one person doesn't mean that persons quality evaluation is relevant to anyone else. So a single person is an even worse judge of quality than sales. Also like anything you need to qualify qualities, as in 'I respect this person, or I think hes a bit of a fanboy idiot' vs 'did this sell because it was good or because a few million people got duped on launch week'?
In general if I was forced to only own the top 10 sales for the Wii I would own, excluding bundles and repeats, full price software:
- Mario Kart
- Wii Sports resort
- Wii Fit
- New Super Mario Brothers
- SSBB
- SMG
- Mario and Sonic at the olympic games
- Mario Party 8
- SMG 2
- Legend Of Zelda
If I was to own the top 10 Wii rated games I would own, same rules apply:
- Super Mario Galaxy
- SMG 2
- Legend of Zelda
- SSBB
- Rock band 2/3
- Metroid Prime trilogy
- Resident Evil 4
- Okami
- Guitar Hero 5
- DJ Hero 2
I see a lot of repeats from one to the other and overall I can't really say that the list of top 10 sales vs top 10 'critically' reviewed is that much different from each other. I wouldn't say that the critically acclaimed software top 10 is any higher in quality than the top 10 by sales of full price unbundled software.
Funnily, I was going to do it for 360 but the top was all Gears, Halo and Call of Duty! 
Tease.
