Is eviscerate bugged?

[WolfCD]

Leveling a rogue on lordaeron and while i never really noticed eviscerate doing way to little damage on icecrown here it seems to do only about 50% or so of the tooltip damage. Is this only while leveling or are rogues in general at a massive disadvantage (seeing that their biggest finisher for 2 specs seems to do only half the damage)?

[xogen]

Armor :)