Marshall defense: 4.Nf3 Bf5 5.Qb3 e6 6.Qxb7

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BSkagen

After (1.d4 d5 2.c4 Nf6 3.cxd5 Nxd5 4.Nf3 Bf5) wikipedia says that 5.Qb3 leads to a clear advantage. Black's recommended reply is 5...d6

Can someone explain this move to me and tell me why following up with 6.Qxb7 seems to be inaccurate?