I actually really liked Met. Found it a lot more easy to absorb than pissing around with a whiz wheel and trying to work out what the hell polar stereographics and mercator charts were all about. So no prizes for guessing the Gen Nav was my nemesis. Principles of Flight was a bit of an arse aswell. Still use a lot of the Met syllabus on a practical basis every day at work and the excellent stuff passed on by Ken at BGS really does come in useful.
The ATPLs won't change, it's an awful lot of study and effort only to dump most of it once the results are in, but you have to pass them to get in the club.