The role of a sunsinger is to keep enemies at bay and kill them overtime. Which is why, by themselves with no perks, all the Sunsinger Grenades suck ass with exception of the Fusion grenade. (In PvP)
Why do people hate on the Sunsinger when their Grenades do exactly as intended, make you fall back and punish you for Rushing.
Which is probably why so many people hate the Viking funeral + touch of Flame combo.
It stops them from enjoying their play style.
If you like to rush, you can't, because if you do, you will be set on fire and thus making you easier to kill.
If you like to hang back and snipe, you can't, because you will burn. You'll need to retreat and that allows others to get close and rush you.
That is what the Sunsingers roll is; keep people away and make sure they stay away.
Hunters have agility and "Dodge" mechanics, use it, and smoke + Vortex us to death.
Titans have outrageous movement when used correctly, use it, and then smash our teeth in with your brawny shoulders.
Warlocks have the same ability, use it, and then punch our face with your glitter gloves.
I love all the classes equally and I don't want anything nerfed. Bring back the old Blade dancer with the stupid invincibility frames and bring back the OMGWTF Sunbreakers.
Hell, everyone crying about the Doctrine of Passing... Oh my god..
I bet they'd shit bricks and pour waterfalls from their eyes if they brought back the old Suros regime that could 5 shot your ass.
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Nobody has declared sunsingers as "to keep enemies at bay". If by that you mean they can zone off with solar grenades then yes they can accomplish that but so can most other classes. Firebolts do too many things too well and the two perks you need shouldn't even be an argument because the other perks are terrible in those skill trees.
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Just like the flame shield which is the only viable option and overpowered because it gives an overshield on hit with great range and even a armor bonus