[elmar]

first: there is no block scalability problem, the size of the block adapts to the number of current transactions.

second: privacy even for regular law obeying citizens do you really want anyone to have access to how much CryptoCurrency you have and the record of all your transactions?

third: at the moment is ASIC resistant and anyone even using a desktop or laptop can mine, personally I think this is very important for effective distribution in less developed countries.