So a 'good striker' doesn't miss sitters? Out of interest, what forwards in Serie A do you like? If you are going to compare someone like Cavani or Falcao to Matri or Pazzini then it's a non-discussion to begin with, because the former two are clearly better strikers, and they cost 4 times the fee because of it. It doesn't mean there isn't room in a squad for someone who can put the ball in the net when the ball is put into the box.
Why does a striker have to be able to create something and score? You just set the team up in midfield differently, get balls into right areas in the box. Look at Lichtsteiner's goal against Parma. When the 'create for yourself' route isn't working you get the ball wide and into the box and someone will get on the end of it.
You'll find that the strikers who create for themselves are often the ones who are most wasteful. A poacher has to be good at his job to play at a high level, and that is taking chances.