No one said that Porsche's don't have engine problems, which they shouldn't have. It is just debatable how often they actually happen. Of the 200,000+ Boxster's how many people have actually had a problem.
I have heard a lot of people talk about IMS and RMS but I have seen very few people post about having it actually happen to them. It does happen, but I think that the forums constantly mentioning it makes it seem as if it happens more often than it actually does.
Just my take on it!