This is a year old, but I hadn't come across it before:
"The building has become a flash point for anti-American sentiment and public disaffection for efforts to modernize the ancient city, which residents, historians and many visitors prefer were left untouched. Visitors have taken to expressing their dissatisfaction in graffiti. MEIER IS A CRIMINAL wrote one visitor in English on a construction tarp. IKEA: NOW SELLING TOILETS AT THE ARA PACIS wrote another in Italian. The site has also become a gathering spot for antiwar and anti-American protestors who point to its lack of regard for its surroundings as a symbol of everything they hate about the United States. According to most Italians interviewed at the site, the modern look is wholly unacceptable in the heart of the Eternal City."
From Newswe(a)k.