BBT is amazing and How I Met Your Mother is a pretty solid show, if only for Barney.
Not a fan of Modern Family but I can see that it has it's moments. US Office is not good at all in my opinion but it's not dire. 2 and a half men is, it's just weak. It was good back in the day but then the kid grew up and Sheen went tits up so...yeah, that's the one I'd pick, too late to bow out with grace but still, too annoying to leave on.