Many people stating that delay in confirmation time is the greatest drawback to bitcoins however i don't believe its an big issue should you add higher charges as if you want to get money in quick time in your wallet then you need to manage to pay higher charges as well as for me its not a big deal.
Yes it is a disadvantage to some extent. But countries with time will realize the fact that bitcoin will help them in eliminating unemployment and strengthening their economy and they will recognize them and will let all their people to access to internet so that they enjoy the miracles of bitcoin and meet their financial needs easily.