Serie A stats last 3 seasons:
2006-2007: Matri(Rimini, B), 28 games, 4 goals. Quagliarella(Sampdoria, A)->35 games, 13 goals.
2007-2008: Matri(Cagliari, A)->24 games, 6 goals. Quagliarella-(Udinese, A)>37 games, 12 goals.
2008-2009: Matri(Cagliari, A)->31 games, 6 goals. Quagliarella(Udinese, A)->36 games, 13 goals.
2009-2010: Matri(Cagliari, A)->38 games, 13 goals. Quagliarella(Napoli, A)->34 games, 11 goals.
2010-2011: Matri(Cagliari-Juventus, A)->37 games, 20 goals. Quagliarella(Juventus, A)->17 games, 9 goals.
Quagliarella has actually been more consistent than Matri over the last 5 years, and he is only 1 year older. In the last five years, Matri has 45 goals in 130 Serie A games while Quagliarella has 58 goals in 159 Serie A games. Matri has 0.346 goals per game while Quagliarella has 0.365 goals per game.
13 goals, not 15.
I want both though, I just think that it is unfair to say that Quagliarella is more inconsistent than Matri.