Baldini was amazing at Roma, all big transfers were his job (Cassano, Emerson, Batistuta, Chivu, Samuel, Mexes). IMO he's second best, next to Moggi.
Who hailed Marotta? We had a poll about a new guy who should replace Secco and Marotta had two votes, he was simply one of the worst (and IMO the worst) option. Sabatini is great but he's more into youth players and I don't think he has the needed experience. Roma is being linked with him and Baldini to come, which is something.
I'm not a fan of Corvino, but he did make some good moves, like getting Vucinic to Lecce.