I'm thinking maybe I'll do some statistical analysis based on the ratio of minus signs / total signs.
Tandora has a ratio of 9/10, or .9 , which puts her at rank 1, higher ratio than anyone else. Assuming a standard deviation of .09 ( a reasonable assumption when accounting for meta, roleclaims, etc.), I give a confidence interval of .9 +- 2 s.d. (assuming that the distribution of her scumlikelihood is normal). 2 s.d. suggests 95% confidence.
Conclusion:
I can say with 95% confidence that the probability that any player who acts like Tandora this game has between a 72% - 100% chance of being scum.