I know Esurge is a good elite, and I've used it before. However, on looking at its description, what makes it so good? Its an energy burn, combined with a less powerful fireball essentially. The AoE is large, however, its not really that much damage. While it is good, I don't see why this gets so much use over others.
Edit: I'm talking about PvP btw. And, what makes E-surge better than say, Mantra of Recovery, in which you'll still get the same amount of energy burned away (2x E Burn vs 1 E surge and 1 E burn) but without the meager damage. In return, you get far more use out of the rest of your skills.
q

Also Esurge, and mesmers in general are utility roles, they complement a team they are not main damage dealers or main healers but they are priceless if ur team knows wtf they are doing.