Per MLB stats, his ERA stayed relatively the same those two season (4.58 to 4.51). His K/BB ratio is about the same as well (in 2002 112/83 and in 2003 108/74 ). His WHIP is close as well 1.41 to 1.37. The opponents BA went from .340 to .329 -> some improvement here.
He has a great outing and then he proceeds to go out and suck for a couple outtings. He is erratic. Does he have the 'stuff?' Sure, but he lacks the intestinal fortitude, to quote CubKilla, at this point. Do I think he can get better or at least more consistant? Sure, but he needs to get that 'intestinal fortitude' to do so.
MLB's Stats for Jon Garland.