The OC: Season 2
It'd be almost impossible to live up to the standard set in season one. But, season two does a fine job at sticking to the formula they do best and the show is still a hit.
I might as well profess my undying support for anything Josh Schwartz produces. The OC was the first instance of his genius and the first true drama to capture my heart. I am proud to say I own all 4 seasons.
For all intended purposes, this is the last season of The OC. It's still good enough to watch, but really starts to slip.