As a player - I think all the supers are well balanced across the classes. I understand that Hunters dominate the top of the list - but I think that is more of a function of both of their supers being offensive oriented, instead of an offensive super (Fist of Havoc, Nova Bomb) and a more defensive super (Radiance, Ward of Dawn). Of all the classes, I think certain Titan players may use their supers the least tactically - like the video someone put up of a sniper taking down people on a capture point and the Titan doing a Fist of Havoc - where there was nobody anywhere close to them. That was a bad tactical use of the super. I think if they add a defensive super to the Hunters, and an offensive super to the Titan and Warlock in the next class expansion - you're going to see the stats on the top balance out.