I think the Oilers defense is pretty underrated. They still have their reputation from last year when it genuinely was terrible.
But they will probably have to be more consistent against the Stars than they were against the Canucks to win. They showed a really high peak level, but shoddy goaltending at times and played poorly on a couple road games. Especially game 5.
Their 3rd period play also left a lot to be desired, but as I said in the NHL thread the Canucks seem to have some kind of cockroach X-factor. They did the same thing to Nashville in a few of their games that series.