I agree, as much as Dolson is touted as a "smart" player, she's looked terrible on defense lately--slow and prone to fouling. Offensively, she runs around and sets screens, mainly looking to pass. I think for the Sky to have more offensive consistency, she should try and play true center on the block. Clearly, though, she's scared to this, and it seems like her lack of post up game causes her and the Sky major problems.
Quigley and Vandersloot are asked to do way too much for the Sky. They're solid guards, but I think it's a big mistake to rely on them for the majority of the team's offense--they aren't consistent enough, at least not this season, and they can't really get to the rim like an elite guard--Deshields, who has her own finishing problems.
Saying all that to say that the Sky rely way too much on jump shots to score. The poorest teams in the league--Atlanta, Indiana, Chicago, New York, even the Sparks when they struggle--all rely heavily on jump shooting.
Of course, all of that is secondary to their major defensive woes. What separates the Sky from the Sparks--who actually have similar offensive problems if you analyze it--is defense, and the Sky don't have the speed or size to be a good defensive team, unlike Phoenix, Sparks, Seattle.