nothingburger vs piece of junk

nothingburger

• A person or object that is bland or unremarkable in appearance or impact. 

• Something of less importance than its treatment suggests. 

• A person who is a nonentity. 

• bland or unremarkable in appearance 

• disreputable, as of a person 

piece of junk

• A bad person or thing; an object of poor quality. 

• Used other than figuratively or idiomatically: see piece, of, junk.