you kinda need some teamplay and a team with some aoe spells to make good use of flux. yesterday i saw him in 1700-1850mmr games some times and the team never made good use of his ult, even though there were many good aoe heroes. without an organized team your team will most likely sleep when he uses his ult to pull them all together. and since he has no stun they can escape quite fast, especially with leap/blink heroes. but i still like him