It's simple (Score 2, Insightful)

Randomly generated content is only as good as the generator. Some games spend lots of time making sure that the code that spits out random stuff is decent and the random content is good. Others just spit out completely random crap and it usually suffers for it.

So everytime someone says it either works or doesnt work in Game X, it always boils down to the quality of the random generator.