They do not care about quality, because most of the time, their audience is the kind of person who walks into a game shop, not really knowing what any of the games are, and will get anything that takes her fancy, so they are not going to appreichiate the amount of care put into the game, and that is in their opinion, the best way to make money out of the Wii.
Personally, I don't think a boycott of ubi is a good idea, because it will acheive nothing, because if all of their games are so crap, everyone here is not going to buy them anyway. I know it can spread, but these are the kind of gamers who have no idea who made the game, or what it is about beyond the blurb on the back
EDIT: paragraphs!