DOHA, Oct 25 (Reuters) - Qatar has faced unprecedented criticism since winning the bid to host the 2022 World Cup, some of which amounted to slander, its ruler, Emir Sheikh Tamim bin Hamad al-Thani, said on Tuesday.But, he said, a campaign against Qatar expanded to "include fabrications and double standards that were so ferocious that it has unfortunately prompted many people to question the real reasons and motives behind the campaign".The emir was addressing a session of the Gulf Arab state's advisory Shura Council as Doha gears up to host soccer's main global event, which kicks off on Nov. 20.Doha has introduced reforms including rules to protect workers from heat and a monthly minimum wage of 1,000 riyals ($275), and says it continues to develop its labour system.Sheikh Tamim said higher energy prices had helped Qatar realise a government budget surplus of 47.3 billion riyals ($12.8 billion) for the first half of 2022, versus a projected deficit, and gross domestic product growth of 4.3%, according to initial estimates."