(at the risk of this place being useful in seeking advice . . . why would you start out your post insulting us? oh well, here goes:)
I got into Georgetown and am starting the Taxation LLM this Fall. I also am doing the Estate Planning Certificate.
My JD was from a top 65 school and my class rank was around top 42%. I graduated 19 years ago, though, and I think my practical experience really helped me get into Georgetown.
My focus in my JD was Intellectual Property law. I did not take a single Tax class in my JD program. If I had, I would not have done well and I think it helped more that I didn't have a tax class at all instead of having a poor grade in a tax class.
Since 2010, I have been practicing Estate Planning. I think this is the second thing that really helped me get into Georgetown. I had a narrow focus on a subject for one of their Certificate programs.
I also had an amazing letter of reference from a JD professor who remembered me well 19 years later.
So I didn't have a stellar JD record, but I had so many other factors that helped me stand out. The Georgetown Tax LLM will improve my JD record, but only because of my experience and current practice area. I don't think I'd spend $100k on a Tax LLM without knowing for certain that it definitely will land me a job with a larger firm in the practice area I absolutely know I want to continue.
BTW, Georgetown was my first and only choice. I live and practice law in Maryland in a suburb of DC. A Georgetown Taxation LLM is very valuable here. If I were in the Northeast instead of mid-Atlantic, I'd probably have to go for NYU to compete.
If you don't want to stay local, where do you want to go? If I didn't get into Georgetown and I wanted a local school, the Univ of Baltimore has a Tax LLM program. That may have gotten me a good job in Baltimore; and it would have been much cheaper!
The advice from atara to get an MS in Tax is worth considering. If you want to work for a consulting firm, a JD plus a CPA is a good combination.