Smuggler and Agents were the hardest nerfed by the surge change, which is easy to see by comparing the base crit of abilities with talents. I doubt anyother class has 23% crit from talents\skills (5% Smug Buff, 12% to Dots, 6% crit talent) on their core dps skills like a Dirty Fighter Smuggler (53% - 55% crit on these skills with top gear). Though overall most classes are getting a 2% nerf where as smugs\IAs are getting a 2.5% to 3% nerf.
Edited, because the post below made me realize that I listed our crit too low.