Even having 45% of the consoles on the market is an incredible difference. As time passes, with more and more consoles sold to consumers, the %-market share figures will flatline more and more and be harder to move - it's just the way math works. Once you sell 50 million consoles, and you own 50% of the market, you have to sell millions to even beat your own market share, and that's the key.
Look at DS, even though they are selling a near 3:1 ratio right now, DS: PSP, in order to bump up to 70% share, DS would have to sell 7:3 ratio, which is both harder, and being only a SMALL change, would take a year or more to even get to 70% market share.
HOWEVER, Nintendo has a lot of BIG games coming up, games that will inevitably move consoles. With all the 3rd party support now, even if the games are crappy, the games will sell at least enough to encourage more 3rd party support. Think about all the mediocre games for PC - the reason they make the games is that EVERYONE has a PC, so the chances of selling your mediocre, or even crappy game, is pretty good. It's a slight snowball effect.
Numbers: Checker Players > Halo Players
Checkers Age and replayability > Halo Age and replayability
Therefore, Checkers > Halo
So, Checkers is a better game than Halo.
