Rogue I found was best if I went combat maces (buy a mug from the AH) and did a simple 3 x SS, Slice and Dice, then 3 X SS and Eviscerate. This should ensure that Slice and Dice is up most of the time, your most crucial combo finisher. It's not the bestest rotation in the world, but it did really well on my rogue when I was multiboxing him.

In regards to the attack power difference, it's completely dependent on the base damage of the skill and the attack power modifier. Feral Druids get ridiculous amounts of attack power, but their base damage and attack power modifier is much lower than a rogues. I know in old ToC raids ferals had over 10k AP, haven't asked one recently what they can hit.