Gundam Masou is by far the best sold PS3 game so far for Japan, so IMO the list does mean something. However 1 interesting title will not sell a console unless it's a Final Fantasy, Wii Sports or Super Mario game combined with positive reviews, especially if the console is expensive. The more interesting titles appear, the easier it's to justify opening your wallet.
Likewise Blue Dragon was also on their list and did wonders for the XBox 360, weekly hardware sales have ever since its release been multiplied as compared to how dire the situation was before (still pretty hopeless though).