Choose it for a compact, elite, melee-first Ork army built around Warbosses, Nobz and Meganobz rather than a Boyz horde. It shines when you want two big Waaagh! turns of maximum-strength close combat and can protect a small model count. It's strong into armies you can grind down in melee; weaker if you get kited or shot off the table before your elites connect. At 2 DP it leaves 1 DP for a support.
Sample gameplan: build around two or three Meganobz bricks led by Warbosses (one with Tellyporta to Deep Strike). Advance up the board and time your first Waaagh! on the turn your threats reach combat, then use Da Boss Is Watchin' to fire a second restricted Waaagh! a couple of turns later for the elites' second charge. On the charge, stack Krushin' Impact for pre-combat mortals and Armed To Da Teef for re-rolls (all-1s become full re-rolls under a Waaagh!). Keep bricks alive with Hulking Brutes and Too Arrogant To Die, and Consolidate onto objectives with Always Lookin' Fer A Fight.