It's always a cat-and-mouse game. The offense is running something that's working against certain looks and the defense will attempt to change the picture or how they defend it. You saw that several times with this particular game where Washington changed what they do to defend the WSU route combinations and personnel packages.
They got Cam once on a robber defense where the defender did something different than expected and it would've been a pick if the DT didn't tip the pass.
To my eyes, where Cam struggles the most is on intermediate routes. As much as he sees the picture changing in the quick-game, he did show some hesitancy and some need to "see it" on in-breaking intermediate routes etc. If you're a Dolphins guy, think of how Tua is a magician on anticipation for that in-cut at 17 yards etc. and that's what Ward really struggled with in the games I watched him.
Turnovers is an obvious answer for what he has to improve upon. Staying on schedule in the offense is very important and Ward too often goes big game hunting when a 6-yard check down on 1st down is going to keep the offense on schedule and in successful situations. Ward wants that explosive play on every down and it gets him into trouble both from an interception and a fumble standpoint (late in the down is where you see a lot of fumbles from hits they don't see coming). He also has small hands and doesn't carry it in a fundamental way in the pocket.
The two-hand rip through while in the pocket is a technique that Ward needs to be spending hours perfecting. He likes to one-hand over the top of the defenders helmet in the pocket and that's a recipe for fumbles. If you hold with two hands in the pocket and "rip" through at the waist and turn your shoulders, it protects the ball and makes you a small target to hit.
Taking off and running after your first two post-snap reads are not there (generally that's three reads since you have a pre-snap read in any Air Raid offense). He could hit his check-down more often as well.
He's a true gunslinger at QB with all of the great and not-so-great that comes with it.