No, it is not. Unless it's an overlay (recover), there should be felt underlayment separating the roofing materials and the deck. Many home builders install roofs this way so that they can save money. It is frowned upon by the National Roofing Contractor's Association, the Asphalt Roofing Manufacturer's Assocation, and any roofer with integrity.
Underlayment provides a vapor barrier between the roof deck and the shingles, is a secondary waterproofing element of the roof, and prevents the wood deck from leaching oils from the asphalt shingles.
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