[C] Boom Bot is used for clearing out sections of the map and for scouting enemies. Enemies are forced to shoot the bot if it spots them, which can create a window of timing for you to pick them off.
Raze’s [Q] Blast Pack isn't just mobility utility, they can also be used to push enemy players back if they are attempting to push through a chokepoint.
[E] Paint Shell is great for dealing chip damage and forcing enemies to reposition. It's wide area of effect makes it difficult for enemies to avoid taking chip damage if timed well.