Yes, we do tend to forget how tough it is to develop top prospects. Conversely, you also forget how often unknown prospects develop into very good players - Utley, Koskie, AJ, Radke, Santana, Youk .... As to Mauer, yes, he was pretty good behind the plate and the Twins are unlikely to develop another HOF caliber catcher soon. But he hasn't really been that guy for a while. And there isn't a lot in his past to expect that he's going to be better at 35. He's been injury prone and missed a lot of games in his prime. Not sure why anyone should expect him to be better as he gets older.