If Carrick was injured/suspended, who would replace him adequately?
Barca have Thiago, Cesc, Song who can come in for their trio, Real have plenty, Bayern have Gustavo, can drop Kroos deeper, Tymoschuk, Dortmund have Sahin and Kehl.
We are clearly far too reliant on one player in midfield and don't have someone to either replace him or a partner that can adjust his game to take over his role.
Bayern spent silly money on Martinez but given his age, potential and what he brings to the team, it will be worth it in the long run.