article_snippet: Per Mertesacker impressed in Arsenal's victory at Manchester United in the FA Cup on Monday evening .
article_snippet: The World Cup winner, pictured celebrating with Aaron Ramsey, has been criticised this season .
article_snippet: The German's performance have been criticised this season, though he was excellent in Monday's euphoric the FA Cup win over Manchester United.
highlights_snippet: The German has been criticised this season although Arsene Wenger impressed in Arsenal's FA Cup victory against Manchester United at Old Trafford .
  