I don't think House of Cards comes close really, especially now that Spacey is out. Game of Thrones is a movement: cosplay, crazy fan forums, ultra wide appeal, the filming location of King's Landing in Croatia is constantly flooded by tourists because of GoT. House of Cards is a solid show, especially season 1, but I'd say GoT is the biggest show in the world culturally right now.
Both good points, too bad that HoC looks to be Spacey's swan song (and deservedly so).
Both good points, too bad that HoC looks to be Spacey's swan song (and deservedly so).