The thing I love about Orks (I'll build on what [@thewizardguy] said) is that they are almost underestimated by the rest of the Galaxy but they have the real ability to destroy them if they got their act together. Ghazghkull is currently under the process of doing that. The Warboss is uniting clan after clan and with their collective might, they would ruin the Galaxy (not including the OP nonsense that are the Tyranids). They are one of the more simpler races and I like that about Orks. Dakka is all they need and all they want. There are no other dreams, no complicated plans or overarching concepts. Unlike the rest of the Galaxy, they would survive on violence, squig meat, guns and nothing else.