While its implementations thus far have been totalitarian, technically true communism (something even the leaders of the USSR admitted to having not achieved) wouldn't be totalitarian, so in an academic sense, focusing on it when asking such a question doesn't make much sense. The question itself is sensible, as people wishing to become American should respect the country's democratic institutions, though in asking it perhaps there should also be a greater effort in improving the quality of those institutions to be closer to those of a true, rather than flawed, democracy.

Also, in my opinion at least, framing it as 'good' or 'bad' moral judgement reflects an outdated view that morals should be regulated, and thus should be restated as simply being in agreement with the principles of the US constitution.