TBBT is not a "parody". It is your standard-issue broadcast network sitcom about 3 males, 3 females and their friendships as they date and break up with each other, marry each other and have kids. This is a successful premise that has stood for decades in American TV. Friends and How I Met Your Mother followed the same principles almost to a tee. That's how you get a show that runs for 10 seasons in this day and age.

Pointing out that TBBT's parody is poor is like saying Will & Grace did not portray a representative picture of gay urbanites.