I think Hit Driven game refers to the idea that the costs to produce game to current HD standards is such that unless the game SELLS above average numbers for this industry it will not make a profit. No profit means of course no revenue being generated with the game. It is a big risk, and since video games have such a smaller market than industries such as movies, and just as much competition if not more it becomes exceedingly more difficult to be a big revenue product in the HD gaming market.
It has nothing to do with being good or bad. Several good games don't do very well in a market where one single game costs $60.00. I barely have enough expendable money to buy 1 game every other month. I could stretch it to 1 game every month, but won't. So that means I am a going to be a very hard sell and only buy what I MUST have.
With Nintendo Wii, games can be cheaper to make, and have a chance to make more revenue. Smaller simple games also have a chance...where on the other systems they are usually only produced as downloadable games.
This is personally why I hate the direction of bigger and more involved stories, CGI, voice acting in video games. It adds higher costs to games and adds very little to the actual GAME part of the game. And the truth is, I can read a great book or see a great movie or just watch even great television for a story. I want to play a game on my Nintendo.