"Friday Night Lights" is the best show.
The entire series has been great, though if you compare season 1 to this last season (4), it will almost be like watching two completely different television shows. The first three seasons are fun, sexy, and cool, as they represent a small little rich football town, while telling stories of football players and cheerleaders. There are good solid stories as the show is based off of a very popular book - "Friday Night Lights".
By the end of the third season, there really is no more story to tell, and rumor had it that the show was going off the air. I was devastated. But they brought it back in all its glory, yet in a very different way.
Not to give too much away, I will be brief:
Season 4 highlighted a not so rich football team and surrounding characters (some new, some old). I didn't know what to think at first, as the stories were incredibly serious. But the show turned into more than just a mind-numbing waste of time, and developed into an hour of captivating, and thought provoking entertainment. Issues of poverty, justice, gangs, pregnancy and abortion, religion, love, racism, losses of a job, being forced to break laws to make a living in this day and age, charity work, life, death, and so much more.
The best part of season 4 is that the acting was phenomenal. There is one episode where the character "Matt Saracen" gave the performance of a lifetime. Character "Vince Howard" is a force each and every episode. "Tim Riggins" is a returning 4 season veteran who just blew me away in the season finale. Also want to mention character "Landry Clarke" who also does a great job, and was also in "Varsity Blues", another fun football movie. Finally, characters "Eric and Tami Taylor" just carry this show each and every episode.
I hear that all seasons are on instant play with Netflix right now, so you could start at the beginning, but just because this season was so different, you could really just pick up at season 4 when they all come out on Hulu.com. I definitely recommend.