Poor Cover

Did receive back a cover, mailed to a friend in Sri Lanka. He told me that I mailed him a "poor"cover. Sad that he bend the cover to me over two of the stamps. Maybe could save them when soaking. Why is this a poor cover? Bad cancellation, thats for sure, but cancellation is just a lotery here in The Netherlands. I can put handcancels on a cover, sometimes do that, but then the cover gets in a bag to the postcentrum and they -the machine-  puts a cancellation as you see here over the handcancels. Maybe you are still able to see a stamp or a part. What to do ?? just tell me.