At least DPS wise, Blizzard have taken out the damage coefficient for Imps because they were doing way too much DPS. So right now the only thing Imps are good for is the stamina buff!

The coefficient has been removed until we can get the proper spell damage fix into the game. When the coefficient was being applied incorrectly, utilizing talents created a dps output for the Imp which simply could not exist in the game without being a large and unintended advantage.

While the removal of the coefficient is somewhat extreme, it is a temporary measure. In a game state, it is no different than having your Imp on passive, so we are settling with that for now until we get the proper fix in.

Blizz are redoing the way they calculate spell damage etc. It might be a bit heavy for some, but interesting nonetheless...

In the Burning Crusade, we’ve decided to make a fundamental change to the way spells calculate the bonus they receive from +healing and +spell damage effects and items. This is because we have seen a growing trend in using “downranking” and large amounts of +healing items, which we feel negatively impacts game balance. Downranking involves high-level players using lower level spell ranks and +healing gear to conserve mana, but maintain a high rate of healing done. Through this method, it has become possible in the live game for healing characters to heal large amounts of damage indefinitely without running out of mana. To maintain progression of use through spell ranks, we are changing how lower ranked spells relate to characters of higher level.