Landorus-T checks so many of the top threats right now it's not even funny. The physical bias in OU makes Intimidate and his strong defensive typing a godsend. His 145 base Attack means you don't have to invest much to take out said threats either. Need someone to deal with set up sweepers like Mega Luke/Excadrill/Terrakion? Gimp and KO them with Lando. That Aegislash or Talonflame ripping your team apart with their priority? Make that priority laughable with Lando. The fact that he laughs at Sticky Web doesn't hurt either.