My TA comes from destinationweddings.com as well, and she's not my first one. I had to change because I didn't feel like the one I had knew anything about the MP. Plus for me the TA becomes a part of my family because all of my guests will book through her, and I want to make sure that she can answer all of their questions.
My new TA is awesome, and is very familiar with the MP. My contract with MP has the promotion written into the contract for 2012 even though the haven't announced their 2012 promotions. So I will get the benefits of this years promotion.
JL I would suggest emailing Amber Hughes about what you are experiencing and seeing if talking with her and changing TA"s could work for you or if it is even worth it to you.
I think in general TA's are either hit or miss, I wanted someone that knew my resort and the rules of said resort.