Ovechkin is a one-trick pony. He gets most of his goals from being left unopened to unleash that cannon of his either in the zone or on the rush. Datsyuk and Zetterberg are far more versatile.
This is an excellent article on the subject.
He is not at all good defensively, and his ability to score has always depended in moderate part upon being able to quickly go on the rush from the defensive zone. That does not lend itself to defensive play.
With Backstrom feeding him, there's no reason why he shouldn't be able to score a lot.
I agree with the article, and it's exactly what I said above. Cover Ovechkin to the exclusion of anyone else. If they can beat you, fine, but that team doesn't have enough talent to do it. If there were any other game changers on that team, you couldn't afford to short change everyone else, Ovechkin would get freed up, and his production would increase.
“We really took [Capitals star forward Alex] Ovechkin away the whole power play," said Muller back in the 2010 playoffs. "We played man on man with him and forced the other four guys to beat us four-on-three.”
That's fine if the four other guys are Backstrom and a few other bozos, but if the other four guys are Pavel, Hank, Kronwall, and Franzen you'd get buried.
Good coaching on Mueller's part, but if Washington had a deeper team he couldn't have used that strategy successfully.