After patch 3.0, I noticed a lot of my guildies had a rather large spike in their DPS just from the new talents. As a feral, it didn't seem my overall DPS actually increased much. Whether this was a partial gain from talents and a partial loss from changing powershifting to the energy return on Tiger's Fury or whatever, my DPS just didn't seem to change a lot.
Doing instances in Wrath my DPS seemed about the same as it was at 70 as I leveled through Utgarde Keep to Azjol-Nerub, etc, at about ~1000-1100 (Yes I know, I probably suck).
And then I hit 75. Savage Roar is AMAZING. My DPS in Azjol-Nerub spiked from ~1100 to 1615 after getting this move. Just seeing some of the numbers you can get made me giddy (I recall a >9k ferocious bite at one point).
Furthermore, it makes juggling CP a lot easier. With just Ferocious Bite and Rip, if Rip was ticking I always had to think "Gee, if I FB now, I'll have 0 energy. Will I be able to get 5 CP again before Rip falls, or just a little afterwards?". This was always especially frustrating if that last CP landed when I had a decent amount of energy, because I had to move away from a boss and couldn't spend it, etc. Just having a new move that doesn't eat ALL your energy gives you so much more flexibility in spending CP that it refreshed my love of feral DPS.
I guess the whole point of this is just to let any ferals leveling up know what's in store, and to let them know if the local boomkin etc has been bragging about his damage, don't worry, the game really is balanced around 80 ;)