Originally Posted by age_master
Siddle has bowled well in 2 series, both against South Africa. He averaged 44 against India in India, which isn't bad but he did go for 4 an over. He averaged over 30 against England, which again, isn't bad. BUT, he took 3 wickets or more in an innings only 3 times. His 5 wicket haul consisted of Strauss and the last 4 wickets which needs to be done but its hardly the sign of a good bowler that he could only do it once in the series. Take that innings out and he averaged just under 40 for the series. But thats not why he shouldn't be considered at attack leader. He doesn't do enough with the ball for mine, and would need to pick up 10pkh or swing the ball more or move it off the seam.
Siddle was making his debut in India, I said at the time that he didn't look very good, but he's come on leaps and bounds since then and its important to remember that hes only played 4 series, and hes not yet 25. Hes leap years ahead of Johnson at the same point of his career, and I would say he is a better bowler than Johnson period.
Regarding what he does with the ball, you are right, his strength is moving the ball off the seam, although he does get the ball to swing in towards the batter and he bowls fairly close to 90mph. Over time he will build on those attributes, which is why it is important to give him the confidence to do so, because he has a decent action and has the foundations to be a very good bowler in the future.