They burn for too long and do far too much damage for something that requires a single button press and some half assed aim. I don't mind them in 6s but for 3 v 3 they're just stupidly strong. Average fire bolt hero: "Let me equip Viking funeral and gift of the sun and throw on my Voidfang Vestments, that way I'll just open EVERY firefight with a shitty grenade toss and burn potentially the whole team for 3/4 of their health. I'm good at this game! UHG? Nerf it? My class is built around these! And built around crazy melee range and over shields and orbiting and high armor/recovery!" I like this game, but it's grenades need some standardization in the name of overall PvP balance. Buff them for PvE, but a grenade as easy to use as firebolt deserves nothing but mediocre damage in PvP.