As far as the playcalling- not everyone can get open in the spot you want them to, nor can they bunch up at the 1st down marker.
Also, Mularkey had to deal with not having a great OL when calling plays.
I don't disagree with a lot of Donahoe's draft picks- only a complete blithering idiot reaches for needs- you take the best guy available, or you pay for it big time when you run out of talented players down the road- everything isn't about right now.