You're right to say there is nothing special about him, but we haven't got anything much better.
Considering the amount of wide players we have, none of them could be described as top quality, especially on the right.
What we have lacked for a long time is a world class winger, as well as a striker, and it still hasn't been sorted out, which means the only options we had were the same old faces, like Walcott, Chamberlain, Campbell, Ramsey, Wilshere, Rosicky, etc, who have all played there but were either not good enough, not suited to that position, always injured, or not consistent.
I think this is the problem, we have a lot of players that can play there, but like you say about Campbell, none of them are that special.
Get one world class winger, rather than several that are just average.