There is an interesting thread going on at Chadrei Charedim on the methodology of the Rambam as compared to other Rishonim here. The person who started that thread has also transcribed several lectures of HaRav Kappach from tapes on this thread.
Marc Shapiro in his book argues against those who would place too much emphasis on small nuances in the Rambam's writing since these can sometimes be attributed to simple stylistic flourishes with no Halachic import intended (See pg. 58). In R' Yaakov Kamenetsky's Emet L' Yaakov on Shas his methodology is to use such nuances to learn out important points in a most convincing manner. I hope to place a post on the subject in the near future.