That has been a valid criticism of Brooks, but I reckon it's something he's working on. In some games in pre season he had Shackleton and Seriki flying past him on the outside, but if Gilchrist is going to play right back, there will probably be less of that, meaning Brooks has to do a bit more on his own.
His mazy run second half is something he's done for the U21s as well - a lot of players lose their composure completely getting into the box, having skipped past a couple of players, but Brooks sometimes gains composure in such situations and comes up with brilliant bits of skill like that.