I find it difficult to argue that any of the following are particularly bad. However, the last is perhaps the least aesthetically appealing or informational.

Guaranty Building
Buffalo, New York
Louis Sullivan and Dankmar Adler

The quintessential example of “form follows function” in architecture, shows how the design of the building can reflect how the building works. The Guaranty Building has three distinct sections: storefronts on the lower level, offices, and mechanical systems on the 13th and top floor. Nevertheless, the building is adorned with ornament that echoes its internal structure.
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Grand Place
Brussels, Belgium

The perimeter of this notable square comprises predominantly 17th century buildings in a variety of styles. The area had been rebuilt at the time by the various guilds in Brussels. Since the square was a center for commerce, a marketplace, emblems (often gilded), text, and other unique stylings were emblazoned over the entrances to buildings indicating the guilds that would have been found there.
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Yad Vashem
Jerusalem, Israel

A complex of museums and memorials document and commemorate the victims of the Holocaust. The architecture of the halls, sculpture, and the arrangement of information within exhibits is distinct and evocative per the intent of that space.
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Wales Millennium Center
Cardiff, Wales
Jonathan Adams

This complex houses three theaters and concert halls, arts organizations, shops, and eateries. The design and use of materials is intended to invoke Welsh history and nationalism. In the tradition of Roman architecture, an influence that found its way to Wales, an inscription by Welsh poet Gwyneth Lewis looms above the entrance. Instead of engraving, the large text forms windows into the interior of the building and thus is internally illuminated at night.

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