JSA. Great book, but turned gradually into crap after James Robinson left. It's currently in it's final stages of decay, since everything but the kitchen sink is being tossed into a final storyline that I doubt will make anymore sense at the end than it does now.
Daredevil since Frank Miller left.
DKSA, of course.
All X-Men comics between the time Dave Cockrum left Uncanny (the first time) and until Grant Morrison started scripting New X-Men.
Every major crossover event for Marvel.
Every major crossover event for DC since "The Janus Directive".
--Rich