Although I haven't taken the exam yet (taking it a couple of weeks) I would highly recommend that you supplement the Micro section with one of the popular review books, this is of course if you require a refresher on micro. I finished micro 2 weeks ago, and read CMMRS 2 weeks before starting my study schedule, here I added some explanation to things that FA didn't really explain well, or added notes that I thought would be important. I did the same for Immuno, I used the immuno section off of Levinson's acouple of weeks before my step 1 prep. So when I reviewed these topics again during my step 1 prep (2 wks ago), I did so a lot faster and was able to hone in on the material a lot better because it all made a lot more sense to me. So with that I followed it with UW q's on those respective topics and scored in the 75-80% range for micro, and 80-81% range for immuno. But if you're not that strong in micro/immuno, I would highly recommend that you lend yourself to a review book such as CMMRS and definitely, definitely get your hands on the Levinson's textbook (Review of Medical Microbiology and Immunology) for the immuno section. This book explains immuno so well and doesn't bother with all the extra unnecessary crap. BTW, most of the diagrams, schematics, and tables in the micro and immuno sections of FA are right off of this book.
I wouldn't be able to say if FA is enough for Pharm or not as I haven't taken the exam yet, but the vast majority of recent test-takers say that it is more than enough. However, I will say this, and not that it hasn't been said before... PHARM q's in World are MASSIVELY difficult!! Okay, maybe not massively difficult, but very challenging.
Best of luck