To be honest, I feel that the label Over Powered or OP is used when what someone really means is they don’t have the team to deal with that particular heroes special ability. I have dealt with Boldtusk and do not see him as more powerful that several of the others.
That is also why I was sad to see then nerf Gambler’s Stance when there were several others that I perceive as more powerful and they ignored them.
Some heroes seem weaker until you get the right combo going and they then shine.
Just my opinion of course. 