One more thing I'm enjoying is having the different titles run their own courses. Sure it makes them harder to put your books in continuity order, but there are advantages which surely outweigh that. Specifically, the teams can focus on what they do well, and you can read a series of three or four books withouth confusing changes in art and scripting style - especially if some of the titles are of a noticibly higher quality than the others at any particular time.