Aaaa I deleted my long-ass reply

Gimme like an hour or two to get off mobile and give you a quality answer.

Quick answer is: a lot of mystery is around beria that's still locked away in the soviet archives, and realistically the best way to gage him would be in the writings of those who were around him during the time he was alive. I'm keeping an equally open mind on him as I do with other Soviet leadership.