I dont recall you banging on about consistency with Harmison where you could make even bigger arguments about his performances at home and abroad. Only the absolute true world class performers of their day - Wasim and Waqar, the Ambroses and Walshes could you say were consistent on all surfaces in all conditions. Even the likes of McGrath and the West Indies quartet of the 70s struggled in the sub continent.
Jimmy is no more or less consistent that your normal decent opening test match bowler.
Career average over 30 is high for a seamer who bowls on green tops half the year. Its also high in relation to the general quality of test nations as it stands. As per the article from SC, have we ever known the Windies, Zimbabwe, New Zeland, Pakistan and to a lesser extent the Aussie all being so poor for a sustained period at the same time.