Quote Originally Posted by Luzahn View Post
The only reason Cerberus was able to do anything at all was because the Reapers had opened up so many other fronts; I'm sure Cerberus was treated as a lesser threat than the Reapers, at least until the Citadel attack.
My reading of Mars when they said info for the Catalyst was missing was that it was heavily implied Cerberus had managed to steal that piece, so going after them was crucial to complete the Crucible. But no-one seemed to care that much, even though they were betting everything on their mystery super-weapon.

Really the whole backbone of ME3's story was quite snarled up, and that's not including the ending.