I'm not against sequels in themselves, only BAD sequels. A lot of people thought X2 was a bad sequel, and although I didn't entirely agree, I feel their pain.

Game companies should be responsible with their sequels, because fans will probably get them anyway. At the worst it can ruin your perception of the game world completely (I am still scarred by Isaaru as a bad tourist guide in X2!) Saying that they have to make money is not an excuse for making a sloppy sequel. You can make more money by doing it properly.