There is some real negative sentiment here, that I understand, but don't at the same time.
Yes, their growth is flattening, they've done some less than honorable things in the past, but if you look at the big picture, they have some great talent (which may or may not be leaving), they really haven't had any prolific product failures or missteps, and they've made a solid name for themselves in the gaming business. (I doubt many of their users or potential users know about the stock option BS or their past with scammy offers)
I'm not saying Zynga is a clear winner, but what I am saying is, they are not a clear loser.