To what extent were Isabella and Ferdinand good rulers of Spain?

Someone who makes a good ruler has to make right choices for the people and the country (or state), should be able to protect their people from invaders and should be capable of keeping if not increasing the country's wealth. This means making sure that the military forces are well organized and powerful, staying friendly with all the neighboring cities (but that is not a must as long as the armies are strong and competent), …

…don't want to, so Spain may appear to be "pure ed" but it didn't unify the people completely. Overall, I think that Isabella and Ferdinand were good rulers because they only took serious action for what they thought best for Spain, even if the way they did them wasn't right. They managed to do this without being overthrown, which also means they were feared but in the end it was what was best for Spain.