Picked up Rust to play with some friends. So far (2 days in) it’s fun. Alright killed someone and had them rage in global, and yes, it’s ‘that type of game’.
I also think Rust is a perfect example of systems and mechanics that work great for a game you play for a short burst, NOT something you are intended to play month after month. If you are playing it now, while at the same time being a disgruntled MMO fan, keep that in mind and consider why. I’ll have more on that at a future date.
Edit: Just to be 100% clear, I was not expecting Rust to be an MMO.
Hardcore Casual 
“I also think Rust is a perfect example of systems and mechanics that work great for a game you play for a short burst, NOT something you are intended to play month after month. ”
I’m having fun and I agree with this statement, but I’m surprised that you made it considering that the systems and mechanics have more key similarities to UO than Darkfall (past & present)..