I get the impression that if they'd held back the review copies until the multiplayer servers went public, its overall score would have been atleast a couple of points higher - most of the reviews focus on the single player, though obviously its lasting value is in multiplayer. Which thankfully doesn't suck.
Yeah, bad move on Nintendo's part. I guess they didn't focus on highlighting the MP like they should have because of Splatoon. Ironically US reviewers should be able to offer a more complete picture of what the game is, so I wonder how (or rather if) the reception will be different.