Very easily in BrE.
Bob: Do you like the new Heritage Tower in the middle of town?
Jim: No! It's just an enormous grey monolith!
Helen: Is the national park worth visiting?
Sarah: Not really. It's just a huge expanse of brushland.
Maybe it's another transatlantic difference. BrE would use "just" very readily in such statements. As I said, "just" means "nothing more than" or it's a way of saying "That's all it is. Nothing more interesting than that".