If you are keeping up with the US schedule, Cougar Town and Rules of Engagement are well written and funny. Starting watching 'cause the wife and teenage daughter watched them, but found I quite liked them.
Fraiser was a classic - as were the early seasons of Married with Children.
My 14yo son is working his way through all six seasons of Get Smart... still makes me smile when I walk in and see him enjoying an ep I saw some 35+ years ago.
Surprised no one nominated Two and a Half Men. Winning!!

I think the real test is time. I found some eps of Let the Blood Run Free from the 80's so DL'd because we had liked it when it screened. We turned this off before the end of the first ep and deleted the files - terrible!