i'm not sure Baldini has been there long enough for his effectiveness to be measured, i remember we all laughed Comolli out of town but with hindsight wasn't he responsible for Berbs, Modric, Bale, Benny alongside the misses, not a bad hit rate all in all
I think you can look at the logic of his dealings and come to the conclusion that he's done a decent job. I still think that we've yet to see the best from these players. Looking at them one by one -
Chadli - could turn into a decent acquisition imo, and he's started to perform recently.
Chiriches - I think he's been pretty good overall.
Paulinho - A first team Brazil player, hasn't shown his best here yet but most players, especially from South America, take a season to adapt.
Soldado - Over 30 goals last season, I think we just haven't set up in a way that is conducive to him scoring goals.
Lamela - rated as one of the top young talents in the world when we signed him.
Capoue - one of the best midfielders in France last season and has definitely shown promise for us imo.
Eriksen - definitely one of the top young talents in the world imo and we got him for a great price.
So I honestly don't think that we did bad business, or that Baldini got the transfers wrong, I just think that we haven't seen the best from these players for a variety of reasons (time to adjust/settle, inept managers, etc).