Here a short picture story what I’m able to do with Rage Burst, maybe someone found it interesting or helpful.
A Lair mission and at the start of my first turn one of my Assault/Infiltrators spots a Chiron and close behind him a Terrorsentinel. My Heavy has jumped in as close as he can, not enough to get line of fire, but lets see this situation first:
Because the Heavy is also dual classed to Infiltrator I can do a Vanish and move so 5 tiles closer, enough for a good Rage Burst position. The Assault Onslaughts him for the needed 2 AP for the Rage Burst. I take my mouse pointer over the Chiron so he is in white shapes, what means the Rage Burst takes him as target and aims at his centre mass:
The result, Chiron dead, Terrorsentinel down from 900 to 310, nice food for my Assault:
Sure, most of this is only possible because Sneak Attack is so strong (mostly OP), but even without it this would end in heavily wounded enemies.