It seems like a lot of people are disappointed by the big bang theory (TBBT) set in this forum. I'm extremely surprised.
Of course you have to be a fan to understand of incredible is this Ideas set. Cool details, like the heating switch or green lantern's... lantern next to the skyrocket.
And seven minifigs ! About the display, it can easily been MOCed and have the kitchen added, etc. Great.
In my country, TBBT is extremely popular, as much as walking dead or game of thrones (to compare with series which are on TV screens at the same moment). The only (fun) TV serie which is as popular here is Malcom. Next, I would say American Housewives or Friends (but it's not as fun as it was in the 90's).
But Dr Who... I'm sure a lot of french people don't know who he is. Well, geeks do know of course. Why isn't he popular ? Because the series have not been on TV screens, or for a short time. David Tennant and Matt Smith episodes have been on TV screens but I'm not sure about the others Doctors... at least I can't remember them.
We have not that much TV series here. Lots of stupid shows (supposed to be fun, ah ah.... kill me please). So when a fun TV serie like TBBT come to us, it's a success. I can imagine TBBT lego set being as much popular as the ecto-1 here. No problem.