One trend I have noticed in many video games produced within the last couple of years is that the game teaches you to play it as you play it and assumes that you haven't read the manual. More often than not, those assumptions are well founded. Mario&Luigi: SuperStar Saga is one of those games where I need the on-the-job training, and Project Gotham Racing 2 (PGR2) isn't.
The manual for Mario&Luigi is so bad that it should be training me on how to use it (like the O'Reilly books do). On every page of the manual there are page numbers for more in depth explanations of the game mechanics, and quite often, there really isn't any info at all except for the page reference. IMHO, good manuals cover the basics up front in a linear fashion (ie, know this, then know this second thing and then know this third thing and you should have enough to go on). The manic, random access info architecture of the Mario&Luigi manual makes it a complete HASSLE to read and nearly impossible to grok when your job, wife and daughter are placing high premiums on your time.