"You could contrast it with The IT Crowd, a series which inverted the power dynamic of The Big Bang Theory by making its nerds and geeks identifiable, and making its “normal” character the subject of mockery. "

I'm not sure I agree. Moss certainly isn't identifiable and I wouldn't say Roy is any more so than Jen. I can't really abide by the argument that The Big Bang Theory doesn't offer any geeks that the viewer empathises with, I think all but the jockiest jock can empathise with Leonard's woes to some extent.