Arguably the US embargo, cut of diplomatic ties, invasion attempt, repeated assassination attempts, piles of money illicitly funneled to opposition, etc. had as much to do with Castro’s entrenchment/radicalization as anything to do with his personal ideology.
Just after the Cuban revolution, Castro was interested and open to US relations, but ideological prejudices and commitments by American elites made friendly relations impossible. Then a feedback loop ensued by which mutual trust was destroyed and both sides were increasingly radicalized.
Many things Castro did over his long career were reprehensible, but the same certainly can be said for pretty much every US president, and most other national leaders in similarly political turbulent situations.
Yes, while the Soviet Union was sending Cuba billions per year, it was much better there.
The Human Development Index puts Cuba at position 40, despite the huge economic disadvantage of the embargo.
[0] https://en.wikipedia.org/wiki/Human_Development_Index#2015_H...
> "One might best summarize the complex situation by saying that urban Cuba had come to resemble a Southern European country (with a living standard as high or surpassing that of France, Spain, Portugal and Greece) while rural Cuba replicated the conditions of other plantation societies in Latin America and the Caribbean," according to analyst Mark Falcoff. [0]
I've left off the bit about racism as that's already been much discussed in this thread.
[0] http://www.pbs.org/wgbh/amex/castro/peopleevents/e_precastro...