So; first pass at a 2000 points of terrible Ork list. The initial plan was just the Shoota Boyz and Storm Boyz, but then I wanted to see how that could be turned into a Brigade Detachment list.
I really don't like that it looks super weak to vehicles/high wound count armies, but... and yes, I know Slugga Boyz > Shoota Boyz 100%, I just like Shoota Boyz.

Plan is for Weirdboyz and a squad of Shootas/Gretchin (maybe Stormboyz?) to jump on turns 1-2, hopefully getting off an assault... after that, I'm not too sure other than push forward and WAAAGH.
Brigade, 2000 points
HQ 1: Weirdboy - 62
HQ 2: Weirdboy - 62
HQ 3: Big Mek on Warbike+
KFF - 101
HQ 4: Mad Dok Grotsnik - 74
Troops 1: Shoota Boyz (30) - 180
Troops 2: Shoota Boyz (30) - 180
Troops 3: Gretchin (30) - 90
Troops 4: Gretchin (10) - 30
Troops 5: Gretchin (10) - 30
Troops 6: Gretchin (10) - 30
Elite 1: Kommandos (5), 2 Burnas? - 45
Elite 2: Kommandos (5), 2 Burnas? - 45
Elite 3: Kommandos (5), 2 Burnas? - 45
Fast Attack 1: Stormboyz (30)+Power Klaw - 265
Fast Attack 2: Stormboyz (30)+Power Klaw - 265
Fast Attack 3: Stormboyz (30)+Power Klaw - 265
Heavy Support 1: Big Gun, Kannon (3) - 99
Heavy Support 2: Big Gun, Kannon (2) - 66
Heavy Support 3: Big Gun, Kannon (2) - 66
To be honest, it looks like it'd do terrible on the table, and yet - it is 150 Boyz+
misc that'd need to be chewed through. That said, it is also 2000 points, so... probably not too hard to do - especially if the Tyranid Swarm is making a comeback.
IG Heavy Weapons Teams could probably crush this list with firepower, point for point (12 point heavy bolter teams, so sad). Kommandos can try to krump some of them though.