In businesses with a category of automotive, how many of them has an star rating below 3?
"Automotive" is the category of business; star rating below 3 refers to stars < 3
SELECT COUNT(T1.business_id) FROM Business AS T1 INNER JOIN Business_Categories ON T1.business_id = Business_Categories.business_id INNER JOIN Categories AS T3 ON Business_Categories.category_id = T3.category_id WHERE T3.category_name LIKE 'Automotive' AND T1.stars < 3