Nobody's thinks a pitcher being bad 70% of the time would be acceptable; the point is that your opinion over Jackson is all based on perception. To you he's inconsistent and any good outings are just outliers vs. his bad games being indicative of the pitcher he "really is." You've created a self-fulfilling prophecy where any bad or mediocre outing he has (regardless of how it's inevitable that all pitchers have bad outings, and the ones that aren't the best tend to have them on a fairly regular basis) is, to you, indicative of the "real Jackson." He's a serviceable, useful pitcher who is a good option to have who is having a rough year. It happens, but he's very likely to bounce back.