Their (sampdo) depth in midfield is good, Dessena, Poli, Palombo, Tissone, on paper these player is far from bad. their wings is well covered too.
They just not have decent subs for cassano n their defense is ewww, but hey we talking about Sampdoria here...
Palermo have very nice looking Squad-18 too, so on paper their squad strong enough for this arena.
But God knows why Serie A teams is underachieved on this tournament, I don't buy squad strength or tactic is the problem, because Serie A is one of the most tactical league in the world, why the hell their tactic is inferior for teams from other league.
I can't deny your point tho, but at least Mentality indeed one of the major problems for Italians participant in EL.