I daresay some rogues would beg to differ.
It’s been several months now since the Mists parted — and took Cold Blood with them, along with many other abilities from our old talent trees — but a number of players are still pining over its loss (among others).
Personally, I don’t miss it much. As a casual-but-committed raider from late Wrath through Cata, I found Cold Blood a hassle: I felt required to weave it into my rotation because it was a DPS loss not to, but despite having to watch that cooldown timer like a hawk and properly time its use with a 5-combo-point Envenom/Eviscerate, the ability had precious little impact on my overall damage output. I never saw its value, though I could envision usefulness in PvP when a guaranteed crit could mean the difference between life and death.
That said, I’m surprised to see it referred to as “passive” and “talent fodder.” It was an actual button you had to push, after all, and it had always seemed like a pretty iconic ability for Assassination rogues even for those of us who didn’t like it overly much.
This isn’t the first time GC has tweeted about Cold Blood, incidentally; several months back he also panned it for having contributed to rogues’ devaluation of critical strike rating. (I’d argue that low EP values had a little more to do with that, but to each his own. :) )