User blog comment:RoznosicielCiast/One day without Ignite and Flash?/@comment-24434281-20130606074526

Flash is used so much because its stupidly strong. Its a "get out of jail" free card all throughout the game. It can only be countered by blinks or by ghost/ms boosts if you dont flash over walls.

It just generally has alot more applications for initiation, running away and securing kills then ghost.