So PS3 had very few games at the top of the charts. While certainly failing to meet some of the software marks it did last year or the year before could be a Bad Thing, I want to say again that looking at a finite number of games that did the very best will always tend to overstate the presence of the dominant consoles. Even if buying patterns were identical among platforms, they'll simply have more games able to pass over whatever the threshold is. Since it's hard to come by lots of real figures, I just cooked up some random ones to play with.
I created a list of 100 random figures for each consoles. Each has a different max, with lower numbers being much more possible. For Wii I've set the max at 400K. For X360, 300K. For PS3, 200K. As things worked out, the total for these 300 games came out to
Wii: 5,361,218 (47.9%)
X360: 3,451,092 (30.8%)
PS3: 2,377,581 (21.2%)
But what about when we combine these lists and choose an arbitrary number from the top?
Top 5 (#5 game: 242,463)
Wii: 1,333,054 from 5 games (100.0%)
X360: 0 from 0 games (0.0%)
PS3: 0 from 0 games (0.0%)
Top 10 (#10 game: 168,535)
Wii: 1,891,860 from 8 games (84.1%)
X360: 358,158 from 2 games (15.9%)
PS3: 0 from 0 games (0.0%)
Top 20 (#20 game: 129,473)
Wii: 2,595,414 from 13 games (71.3%)
X360: 911,943 from 6 games (25.1%)
PS3: 131,542 from 1 game (3.6%)
Top 30 (#30 game: 97,341)
Wii: 3,214,541 from 19 games (68.1%)
X360: 1,258,799 from 9 games (26.7%)
PS3: 250,094 from 2 games (5.3%)
Top 40 (#40 game: 80,384)
Wii: 3,569,051 from 23 games (63.8%)
X360: 1,512,961 from 12 games (27.0%)
PS3: 514,281 from 5 games (9.2%)
Top 50 (#50 game: 67,912)
Wii: 4,015,559 from 29 games (63.4%)
X360: 1,651,870 from 14 games (26.1%)
PS3: 667,904 from 7 games (10.5%)
Top 100 (#100 game: 36,804)
Wii: 4,669,542 from 42 games (53.1%)
X360: 2,595,609 from 34 games (29.5%)
PS3: 1,524,713 from 24 games (17.3%)
Top 200 (#200 game: 9,381)
Wii: 5,246,804 from 70 games (48.3%)
X360: 3,352,618 from 69 games (30.9%)
PS3: 2,260,245 from 61 games (20.8%)
Of course this is not a perfect reflection of sales reality. There won't be an identical number of games on each console, the sales spread won't be so random and even between nothing and the maximum, and so on.