You should waive the right.
http://www.prelawhandbook.com/letters_o ... mendations
Essentially, it just makes it more likely that the law schools will take the contents more seriously.
By the way, that wasn't a horrible LoR, it just seemed a bit impersonal. Try to get a better one than that, but if you can't it won't really hurt you.
(Applications Advice, Letters of Recommendation . . . )