fans base their picks mostly on looks
and on previous roles more so than the real acting talent meaning that they pick actors who have done a comparable role so to prove their point

the thing they dont think of when studios/directors eventually pick people like ledger is that we as fans know NOTHING about this movie at that point

people were crying out how ledger was a stupid choice but its not as if they had read the script or know nolan's vision on this character and who fits that best

fanboys need to stfu