Pizarro is a wonderful player (not much more to say than that haha).
Wilshere is an interesting player. He has great technique which is the base of any good player. He shows very good maturity for a player of his age, but still has this aggression and drive to get forward. Not really sure on what his best role actually is. Arsenal are a lot different to many teams in the style that they play, everyone has an urge to get forward and it's all about pressing and positioning higher up the pitch. For England I can see his qualities being squashed as a simple central midfielder.