It prolly helps that I didn't start buying new comics until after Final Crisis had run it's course, so I didn't have to worry about burn-out. It also helps that one of the first titles I started picking up was GLC, so I know at least half of the lead-up going in. I'm picking up BL: Batman for the same reason I started picking up GLC, Peter Tomasi. I'll prolly leave the other tie-ins alone.
Though I've been hearing about a Wondy tie-in penned by Rucka! That's something I won't be able to resist!