For Comedy, you have to watch Modern Family, New Girl, It's Always Sunny, Archer, and I'm gonna suggest taking a shot at Bob's Burgers. The writing has really picked up for that show.
For Drama, any show on AMC, FX, and HBO is guaranteed entertainment. Though I have no desire to ever watch Mad Men. Watch every episode of Dexter.
Other than the few sitcoms I mentioned, there is absolutely nothing worth watching on network tv anymore. All the best writing is on cable.