About all I took away was "roach pre-patch 13 was imba."
Fixed.
But seriously, FF wasn't nerfed in any meaningful way by patch 13 (no one makes ultras because they're useless, colossi and thor are never going to be in position to be able to break a FF).
Maybe you should consider that when you're getting owned by FF (or anything else) that it's because the other player is better than you, not because FF (or anything else) is imbalanced. Before blaming imbalance, blame holes in your game. If you outplayed your opponent but still lost, then it's time to consider whether there's imbalance.
Whenever I lose, I can easily point out a number of things I did wrong that put me in a bad situation where it's (virtually) impossible to win. Honestly, I make so many mistakes and those mistakes have several orders of magnitude more influence on the outcome of the game than any possible imbalances, that it's impossible for me to meaningfully make any statements about balance.
If anything, pre-patch 13, zerg was the strongest race. They by far dominated the Asia server where there is the most talent. And most of top-level players I know, if they claimed any imbalance at all, said that zerg was a little stronger than the other two races.
I'm not trying to pick on you in particular, but I get really frustrated when people start blaming things on imbalance in the game when 99% of the time, the only imbalance is in skill. The only time I even considered imbalance was when I kept getting owned by mutalisks in PvZ, and I rage-quit one game. But then I learned to get blink, and it turned out I was just doing things incorrectly.