A friend of mine who is very familiar with Middle Eastern food was less than satisfied with Kabul, saying the food was not the real thing -- I suppose it isn't, but I've tried various dishes there and some of it is pretty interesting and tasty for what it is. I think that some of the dishes have been toned down or Americanized... Some of the items could've been spicier or might've been fusion dishes. However, their curry was pretty decent if I remember right (not quite spicy enough for me though), my guy likes their salmon, and they have reasonably priced lunch deals.
Service, however, isn't great as some other reviewers have mentioned -- It's pretty slow, so make sure you have plenty of time before coming in.