You're absolutely right, DC WAS a great driver. But not anymore...
Can't you see, he's driving a McLaren for god's sake ! shouldn't he be on a podium at least for one time ??!! he could not even make it to the top four. His time has passed, he's not competitive anymore
I am not saying that AD is a great driver and is a great replacement if Button can't/won't drive for BAR next year. But I really think that AD needs the opportunity to prove himself and to others that maybe he is as good as JB or other young drivers.
That's why I prefer AD to DC cos I don't think DC is good enough anymore, bu if there's another candidate for the job such as Mika then maybe I'll go with Mika.
(If I could choose a pair of drivers for BAR next year, I would go with Button & Alonso. that's a dream pair...)