Voidwalker is good for clutch PvP plays and crowd control via AoE burst damage, but the lackluster melee and subpar defensive capabilities make it a hard sell for me when Sunsinger brings so much more to the table in its neutral game. I think the Voidwalker is a very fair and fun class, which is its biggest weakness in a competitive environment where you need to be as ruthless as humanly possible to have the most solid chances at reaping the best prizes thanks to the awful reward system. It also doesn't help that Nova Bomb does a notably worse job at crowd control than Stormtrance in endgame PvE while struggling to deal meaningful damage to the toughest majors and bosses.