Hamlet is utterly disgusted with this custom. He feels that this custom has given Denmark a poor reputation: "They clepe [call] us drundards..." (Lines 18.3 Norton*) Hamlet is furious because this custom detracts from the positive achievements his country has made.
*The lines I have referenced are from the Norton Anthology (based on the Oxford edition). In the footnote of my version it states that there are lines that were omitted in other versions. They have indicated these as lines 18.1 - 18.22).