Which fanbase will act the craziest...

[Kantor]

To rephrase that question, which fanboys react worse to negative reviews, Sony or Nintendo?

I would say that, in general, it's Sony fanboys. Nintendo fanboys are more used to seeing games get review scores below what they "deserve" (i.e. what was expected and what constitutes the user's opinion). So, Uncharted 3. Of course, the majority of reviews will probably be above 90 again, unless something goes horribly wrong.

I have used the term fanboys and not "fans" to distinguish between regular fans of a game and those who take it to a trolling level.