He's failed abysmally in that role at Arsenal, hence the fact they dropped him back to defensive midfield. He missed all but three games last season, and in the season before he managed two goals and four assists... one of which was in an u21 match against Stoke's kids. in 2013/14 he managed five goals and five assists, which is his best ever season (statistically) in the prem.
So far with Bournemouth this season he's scored zero goals and provided one assist. In 1200 minutes. If he was a decent attacking player he'd be having the sort of impact for Bournemouth that Sigurdsson does for Swansea, or Snodgrass does for Hull.
He's spent so much time injured that he is the only player I have yet found on transfermarkt who has an entire season of stats simply missing from his profile. Go and look for yourself: try to find his season stats for 2011/12 - you can't even search that season for him, it's not even an option on the drop-down menu.
http://www.transfermarkt.co.uk/jack-wilshere/leistungsdaten/spieler/74223/plus/0?saison=2016
Massive, massive swerve. Not worth a penny.