I never understood this acquisition in the first place. I was surprised to learn that OMGPOP actually did produce more than one game[1], but I had previously only heard of Draw Something, which my wife and her facebook chums had already grown bored of by the time Zynga came knocking last year.
Forgive my naivety, but don't these things have to get past a board of shareholders with a public company like Zynga? This isn't just a hindsight-is-20/20 kind of thing; IIRC the general consensus at the time was that it was a risky, ill-advised acquisition for a potential one-hit-wonder company.