Umpires screw up. They're human. But they're consistently unbiased when they do screw up, and for the most part they're pretty damn good and consistent in making the correct decision. The Watling screw up was definitely an outlier, if we look at it quasi-statistically.The second Chanderpaul decision was ridiculous because of how wide the ball was...but then we have decisions like Watling who was as plumb as it could be and he got away with it...i just want to see some consistency.
If they'd given Chanderpaul not out, it would have been a screw up -- he was out. Just because that screw up is more structurally ingrained because of the whole 'benefit of the doubt' idea compared to the Watling decision, doesn't mean Chanderpaul was unlucky. It just means Watling was ridiculously fortunate to benefit from an umpiring error. Chanderpaul being given was not an umpiring error -- the ball was hitting the stumps. The umpire should be commended for getting the decision right, not vilified because other umpires tend to get that decision wrong.
And FFS Chanders, you're 40 years old and have over 10 000 Test runs to your credit at over 50. Everybody knows you can bat, so bloody well use it in that circumstance.