Hi British English speakers (and former colonies too),
We rarely use "rubbish" here, and I don't have enough interaction with native BrE speakers to know how it's used in contexts other than referring to actual trash/garbage/refuse.
I heard a child talking about a holiday he was not impressed with: That place was rubbish. I know I've heard things like "That type of talk is rubbish."
I THINK I've heard it used only after the "to be" verb. Is it ever used before the noun? It was a rubbish town, that was rubbish talk, you eat rubbish food?