To be honest, I believe merc lord can be substantial enough on some maps to swing games. I believe if sylvanas is nearby a bruiser and siege camp on haunted mines, the advantage is more than double a 60/40 or 70/30 split if sylvanas is nearby to help the push. I believe the life drain or follow through are the only other talents and both are weak unless you play sylvanas as "hold the q" ( this is very fucking wrong, you are a bad sylvanas and need to switch heroes if you are not...