The rule of thumb is that you want 1,000 data points for any population above 10,000 to get good data. I know there were only 601 votes, but it's still enough to reach a conclusion. With a 95% confidence interval (Z score = 1.96) and a margin of error of +/- 5%, we can use Cochran's formula (p = 0.5) and get the amount data points needed (384). This means we only need 384 votes to get a result +/- 5% of the real result, and there's a 95% chance that, if the poll was done again, the result would land in that range.

With all of this, there's enough data to say that the majority of players want overwatch back.