I don't think of myself as a person who rewatches things often, even though I have a quirk of rewatching the scenes or moments dozens of times if I find them awesome or very funny.
Still, so far, I've rewatched the whole Scrubs (excluding the last season; in Russian dub - folks here did an amazing job at dubbing the series, it's the only English-language cinematograph I dared to do this to, because most often the dub quality is offensive), Intelligence (the US series), am rewatching Chuck and avoiding rewatching Person of Interest.
The first and the third attract me with their simultanious providence of drama and comedy, and do it well. Intelligence, on the other hand, is a serious mostly-drama story with an emotionally healthy male protagonist, it shows a healthy development of relationships between main characters and it deals with hypertechnology. Too bad the latter lacks scope and depth that Person of Interest provided at times: it would make an amazing show with.
Person of Interest impressed me from the first episode on. Even though it lacked at times, it dealt with the subjects well enough to pick me up when I was falling off. One thing that impressed me in particular is how, after four seasons of establishing the character, they've managed to deepen John Reese's story in 4x20 masterfully (I'm a guy who's not in contact with his emotions, but I've felt for John at the moment, which ought to be telling), and how well the episode was made overall (it's the best episode of the show so far, even including the hyped "If-Then-Else"). I'm afraid that I'm going to spoil the image of the show in my head; I'm hoping to preserve it, at least until it finishes. Maybe then, like with Chuck, in a few years, I'll get back to it.