Like I said, he's very consistent, but he tends to bowl short of a length and that's why you see lots of playing and missing. It's not bowling that is likely to take the edge of a front foot drive or forward defence. A lot of the actual wickets were just stupid loose back foot shots. With his talents, he'll get some good batsmen fending off back of a length, but it's not necessarily the best way to attack batsmen.
McDermott got driven a lot in the final, but that doesn't mean a full length is a bad length. He certainly can't complain about plays and misses. On their days, that is how McDermott and Richardson came into the game, they threaten the stumps and draw the batsmen forward. When they find movement off the pitch or in the air, the batman is fatally committed.