People who leave a country tend to leave it for a reason. If they liked their life in Cuba presumably they would have stayed. They are probably not a neutral source on Cuba.
Who is a neutral source when asking for the opinion about a dictatorship?
Most immigrants don't have anywhere near as bad an opinion of their home country as Cuban-Americans.
The hatred towards Cuba by Cuban immigrants is much higher than most other immigrants. This indicates that Cuba is worse than most countries.