Suits Season 1.
I love that before I watched this show, I had absolutely no idea what words like pro bono and subpoena meant, but now I know a considerable amount of law vocabulary. Granted I had to google these terms as they came up, but if you're not as curious as I am then you'll still have no problem understanding what's going on.
Despite the fact that the cases looked at by these lawyers are often of a very serious nature, I would say that this show is still lighthearted and funny. There is a brilliant balance between the serious and the amusing without being insensitive at all, which is impressive.
Each episode is a standalone story, but there are some threads, usually involving the characters' personal lives, that run through all the episodes. We get a really good look at Mike's personal life so you understand quite a bit about his character. In contrast, Harvey's personal life is pretty elusive for the most part, keeping his character shrouded in a certain air of mystery and the combination of Mike and Harvey makes for an awesome duo. These two could definitely be the new Batman and Robin - but better. So much better. For the most part each episode is simply centered on a new law suit that needs to be looked at, but romance and friendship are also consistent themes.
All in all, this show has everything. Suave characters played by brilliant characters, an engaging storyline, witty dialogue, great camerawork and a snazzy soundtrack. I really could not recommend this series any more.