Slight Correction, Kill Rig has a 6+ Invul because it is Beast Snagga but that is about it.
They did make the Kill Rig like a Character so if you gave it a Warlord Trait it ONLY gets 1 warlord trait.
The Ork Codex is NOT top tier, nor is it even CLOSE to Dark Angels in strength. It DOES have a ton of playability and viability but the strats are bad (we do have an anti Tanglefoot strat!!!, we only have 1 turn of advance and charge all game, and yea... I am not a fan of the army rules, but I am happy about the Kulturs and the Units for the most part.