The attack boost from a mithkabob is more worth the accuracy bonus from sushi in low/mid levels. Rice Dumplings give fair attack+ as well as Accuracy+5. Even if your accuracy is only 60% or so, adding another 10-15 accuracy won't boost your total DoT as much as eating meat will. By the time you get to the point that you can use Sushi for a significant enough bonus, you should have enough accuracy gear available to you to be able to keep using meat anyway.
Edited, Jan 26th 2008 3:54pm by bsphil