Has he always been banged up? Because he's been inconsistent in the playoffs and regular seasons. Look at the last three playoffs and see how he'll score 35 one night, score 8 the next night and come back with 28 the next night. That's Puro Ginobili. Even Oberto talked about how in Europe, Ginobili would always follow up bad games with good games.
And that's not even a knock on him. Having one flaw isn't a bad thing. When Manu averages 20 points in a series, it's usually because he score 30 three times and 10 three times.
Again, if the Spurs are going to construct their team in a way that demand Ginobili score 20 points each and every night, they aren't going to be too successful and they aren't using the great player that is Manu Ginobili correctly.