Reagan was elected as a two term president and remains one of the more popular presidents in recent history.
Reasonable people may respectfully disagree about whether or not he was a good president and whether or not he took the country in the right direction, but I think anyone saying he was not a successful person is using a very different definition of "success" than the common meaning.
Yeah, It wasn't the unsustainable economic, political, social and environmental system that was Soviet totalitarianism. It wasn't the thousands of political dissidents in Easten Europe who were active, organizing and being persecuted before Reagan was even elected.
No, it was all because your Actor-President gave a nice speech and ran a deficit.
(If I was American I'd probably vote for Democrats most of the time, but it's funny how users seem to know exactly what did or didn't cause the fall of the Eastern Bloc)