Let's start with
I think Quenneville phrased it better, "It was a tough hit. A dangerous hit." A tough hit, a dangerous hit, but for the most part it's not a penalty. Watch Craig Adams pushing Ovechkin face first into the boards. It was more dangerous than Campbell going shoulder first into the boards (broken neck or broken clavicle?). But Ovi got up, Campbell didn't. Adams didn't even have a penalty, Ovi got 2 games suspension.
Bob McKenzie's tweet:
Truth is the Ovechkin hit on Campbell, or some form of it, happens in almost every game, but if there's no injury, there's no penalty.
So there, Mr. Mirtle, it's not always a penalty, it's even opposite for the most part.
Now let's see what other players, journalists and coaches say, was it malicious,
[Update: Oops, I've got a comment from James Mirtle himself. I read it again and my apologizes to Mr. James Mirtle, he didn't use the word "malicious"]
And finally Olympic gold medal and Stanley Cup winning coach Mike Babcock's reaction:
Well, maybe it was not a final note. I've got an email about Barry Melrose from Catherine, "I just watched Barry Melrose speak on 'Pardon the Interruption' on ESPN during the "Five Good Minutes" segment. He spoke extensively on the NHL hits of the past few weeks and vehemently defended Ovi's hit on Campbell. Just a heads up so you can look for it, or parts of it, on YouTube. It was fantastic."
I'll post the video as soon as it will become available.