Birthright was a simplistic retread of the bad Silver Age ideas.
It was a sad stretch at attempting to make parts of SMALLVILLE canon. When will the industry learn that there can be more than one version of an idea? SMALLVILLE can exist and be loved, just as the Byrne-created era can be loved. The two do not need to be mirror images of each other.
Birthright was a waste of time on Waid's part, and a waste of talent on Yu's. What's so great about 48 years of silly, silly concepts that's worth trying to bring back? A Super-Dog? The "S" being the family crest?! These leaps of plausibility...even within a comic book...are simply childish.
Forget Birthright. It bored me with issue #1. Issue #2 wasn't any better. The current books are pretty lame, as well. And, yes, I LOVE Byrne's Superman. It was smart, decisive, and welcomed common-sense fans from outside the medium with a confusion-factor of zero.