The Economist describes the falling quality at Maastricht:

an abundance of ordinary offerings, not so much second-rate as indifferent. Dealers have clearly found it hard to source fresh, top-quality works during the recession. Much of the art was even quite stale: Antonio Guardi’s beautiful 18th-century “View of the Villa Loredan at Paese”, presented by Simon Dickinson, a London dealer, was on its fourth Maastricht visit, after a winter with another dealer and no buyers in New York.

That doesn’t mean there are not finds like the Igbo sculptures on offer from Bernard de Grunne:

Much sought after by French, Belgian and, increasingly, American buyers, these pieces are both fragile and rare, and they seldom travel. The demand for African art has grown over the past five years, and it is expected to expand yet further with the opening of the Museum of African Art in Manhattan next year. Several buyers were keen on the most important statues—a male and a female carved by a sculptor known as the Awka Master—which ultimately went to a European collector for close to the asking price of €400,000.

Or this Dutch Master work:

John Mitchell Fine Paintings, a family dealership in London, arrived with a Dutch winter landscape it had found in a French provincial sale last summer. The picture came from a chateau in central France and was so dirty as to be almost unrecognisable. Auctioneers described it as Dutch school (circa 1620) and estimated its value at €20,000-30,000. Some cleaning and a good deal of research established it as a hitherto unknown work by Adam van Breen. Dated 1611, it is one of the earliest known paintings of its kind, and was snapped up at Maastricht by the National Gallery of Art in Washington, DC, for €910,000.

Going Dutch (Economist)