Since boys are really good this edition you need a lot more than in previous editions and they will do most of the work most of the time.
Characters to buff (Warboss, Ghazi, Wyrdboys, Doks, Banner,
KFF Mek)
Some fast stuff to tie up enemy shooting / make additional pressure (Kommandos, Stormboys, (Nob) Bikers, Koptas)
A bit of shooty stuff to do extra demage / weaken stuff / camp on objektives. (Big Guns / Mek Guns, Lootas, Tankbustas)
Nobs with ablative ammo runts are also very good.
Trukks and wagons are more durable but all the enemy weapons do more demage now.
KFF is a must take, few drops also help to get first turn and move at least 1-2 times before loosing your stuff.
This is what you will see with most competitive lists nowadays.
Going for shooty / speedfreaks / other builds means you need to spam it to compensate the bad
BS & hit modifiers / mass of antitank.
Not all that much a nobrainer like green tide but still playable. Mixed lists have a hard time though.
Playing Maelstrom helps a lot and adds to competitive ork gaming.
I am very curious, while orks are very fun now, I rarely win and they are constantly dieing to gun fire, so I am wondering what people are doing with them that I cant seem to figure out.
What are you playing with mostly?
Fast stuff to tie up gun lines helps a lot and you can get in
CC pretty fast in 8th edition in numerous ways.