Mark Waid is usually a good writer, but definitely not a great one. I would liken him to Chuck Dixon, whose comics are of a consistently high quality, but has never written anything that blew my mind or resonated me on a deep emotional level like Moore or Morrison.
Back to the thread, there's nothing really wrong with Birthright, but it's not particularly memorable either. The most notable thing about Birthright to me is that it's the only big project Leinil Francis Yu has done for DC.