I agree with everyone in saying it was rushed, but whenever somethings rushed I always blame it on the editor, and not actually the mangaka herself, since it usually is the editor's fault. They're the ones that say, "make it shorter", or "make it longer" and the poor mangaka has to change it.
(Being a mangaka is my career goal, so I've researched)
But going on to the actual ending, even though it was rushed, I have to say I was ecstatic and a little crazy when I was reading it.
Reaction to Inukag marriage?
"Ma...ma...ma...ma...ma..ma...ma..ma..ma...mar...ied?" *hyperventilates*
10 years of waiting for that moment led me into insanity.