I think part of why Nak's run has been bashed so much is because when news broke that he signed with WWE alot of NJPW fans on the forum I used to post on (and the internet in general) were saying he was going to come into WWE and put all of the WWE fanboy favorites to shame in terms of in-ring work/matches. And, well, that didn't happen to the degree some of them made it seem it would.
He's still had a solid run, though.