Big bumpin is a mediocre racing game that is exclusive to the xbox 360 that at one point outsold gears of war 2 and it may still do.
Sure sales are important in a sense, but most people are forgetting other factors. Like the playstation 3's high price, the demand for a price cut, lack of advertisement, the xbox 360's one year head start, quality exclusives that makes a console (not sales), etc.
Bioshock received very positive reviews, but wasn't a big seller like gears of war and halo 3. Same applies to killzone 2.







