The Big Bang Theory?

I seriously don’t understand how this show is the #2 sitcom on TV…It’s 2 and a half men with a thesaraus. There’s nothing new original or innovative to the sitcom world. And the characters are completely unrelatable to someone who considers himself a nerd but the biggest insult of all is you can’t get this show online ANYWHERE! No netflix, no hulu (thanks CBS) and you can’t even buy it on iTunes?!!! who the eff keeps their show from being SOLD digitally? Just another reason to avoid this somehow popular sitcom…my opinion anyway…