I find that a lot of them are practically useless because they're so generic. To be honest, I haven't even bothered looking at them for my last few exams.
LPI has spoiled me. Check out their list for LPIC-1:
http://www.lpi.org/eng/certification/the_lpic_program/lpic_1/exam_101_detailed_objectives
They even assign a "weight" to each objective, so you know how in-depth you're supposed to study the material.
Compare that to 70-236's:
http://www.microsoft.com/learning/en/us/exams/70-236.mspx#EDG
I'd like a better break-down of each objective, so I can get a better idea of what they actually expect of me.