I don't think he'd suit you. When Carroll is in the team, the midfield might as well not be there, whereas you guys seem to be wanting to pass it around through midfield (I guess maybe since you have no proper striker?). His immobility really stifles his team mates own movement and unless you have someone like Nolan who is just going to hover in his vicinity and not do much more, he's pretty redundant. It's easy to set up against and to be honest, he seems to have lost his desire...at least to play for West Ham, in my opinion.
I would keep him as a sub, but as it is, he's burning a huge pony tail shaped hole in our wage bill whilst sometimes not even making the match day squad when "fit".