He ain't even performing in ODIs and T20's apart from a couple of heroics against India, He hasn't delivered what was expected from his comeback. Guess 5 years time is enough to make you rusty. He bowls well in important matches but in normal matches he appears not so focused to get wickets. The drop catching is just a lame excuse, Wasim Akram had the most dropped catches yet he used to get out batsmen via bowled or LBWs. Great going bowlers don't make such excuses.
Having said that, I must add that its a sad story as its too early in his career. He is leaving tests because he couldn't make up any mark since his return while he was very much needed to perform in test matches to strike specially in the overseas pitches of England, Australia and South-Africa but he failed to deliver...