Please give me some feedback

6 pounds a week is great!  You are going in the right direction.  Follow your plan.  Don't get caught up in the numbers.  

I believe that is right around where I was at 3 weeks out and my Dr was happy with it.  Your doing great, your going to have times when your loosing quickly and times when your going to stall.  Main thing is to stay with your plan.  Keep up the good work.

find a new nutritionist IMO.  6lbs a week on average is huge, no one should ever expect that much!  perhaps if you didnt do a liver prep diet pre-op and she was expecting a lot of water weight loss ... but even then, this is a lot of weight to lose.   esp considering many stall at 3 wks.

18 pounds in 3 weeks is rocking your sleeve seriously she is entering into the realm of quakery but go you just stick to plan and watch those goals