Subjective nowadays for modern cars especially continentals.
Some purposely make the oil evaporate or burn due to lubrication/cooling purpose for high heat/pressure components. (Especially turbocharged engine)
Japanese cars like Mazda rotary engine also designed to burn oil for apex seal lubrication. 
Unless the engine original is not like this and only after few years gradually using engine oil for a lot example over 1L need refill for 1000km then this is excessive and need to be inspect & repair.