In his defence, the signings he has made haven't been bad. As he himself says, he could go out and sign several bad players for the sake of it. When you look at the players who he is aware of but not interested in signing, or the players he's watched, you see that the net is wider than Oliver's targets suggest.
Martins has done ok for a £10m player, Sibierski was a lucky signing, Duff wasn't needed and Bernard and Rossi have been flops (albeit inexpensive flops).
Roeder is sounding like a stuck up bitch who maintains she's holding out for "Mr. Right" and before she knows it she's a 40 year old spinster living in a house full of cats and its too late.
The reason he got the job is supposed to be because he was the best manager available, better than us or any of the other candidates but to date his work in the transfer record is abysmal. The players are there, other clubs have signed them but Roeder's problem is that he can't identify the right player for the right price which is a huge part in being a successful manager.