I'd give him a new deal myself; I think with Carlo here that's a relationship taking us in the right direction.
Out of all of Brands' signings the only one that's looked a bust really is Iwobi and mostly because I'm not sure what position he was brought in for. I don't count deals like Delph or Lossl because they're low end of the fees. No DoF in the world has a 100% hit rate. Monchi was terrible at Roma, Rangnick has brought in some bad players, Campos at Lille too, it happens.
The squad regressed from Moyes/Martinez to when Brands took over and the squad we have now, whilst still a work in progress, is so much better than what Martinez had.
To me we definitely need a new keeper (club knows that hence Romero/Olsen), definitely need a new RB, could do with a pacey midfielder and then adequate forward cover (think this can be one player).
It was never going to get fixed in just one Summer.