Before the new script was implemented I farmed TBC dungs quite well because of the decent amount of green items they dropped.
After the I update I couldn't manage to get a single green item in a single run. It'll take 2-3 full run for a single green item to drop.

As the title says are the green items on TBC has low chance dropping than before? I looked up youtube and saw some retail & other servers people farming TBC dungs with a high level toon with decent amount of green item drops.