one-trick pony

noun

1. informal.
   a person or thing considered as being limited to only one single talent, capability, quality, etc

Example Sentences

But such a blindside can be executed only once, and so what had been emotionally affecting about “The Sixth Sense” swiftly became a gimmick — or, in the case of Shyamalan’s much-derided 2004 film “The Village,” validation for those who thought the director was a one-trick pony.

From Los Angeles Times

Hulst calls the A330-900 “a one-trick pony,” that an airline will buy only if it precisely fits its route needs.

From Seattle Times

Trump is a one-trick pony whose approach to every situation is the same toxic brew of grievance, vanity and hate.

From Los Angeles Times

“Biden is a one-trick pony. His goal is to ban firearms ownership. Not solve our violent crime problem and make us safer,” said Alan Gottlieb, executive vice president of the Second Amendment Foundation.

From Washington Times

“City Hall is getting a reputation as a one-trick pony that repeatedly decides to double or triple a property tax as if that were the only source of funding,” Pedersen said before the vote.

From Seattle Times