Wrong about Shatter. Fade has a 0.8s cast time, Shatter has a 0.45s cast time.
Right about D.Va bomb provided allies huddle around you and trust in your timing.
Wrong about Blizzard. Moira will have to fade into the middle of the blizzard. Blizzard lasts for 4.25s, Moira will get frozen herself trying to get out.