It's a hard accomplishment to get someone to actually love a serial killer. But Dexter is one of those few attempts that works. It's not forced upon you- the show doesn't shove the whole "well this serial killer had a terrible childhood..." in your face. And it doesn't need to in order to get you to love its main character. You just do.
Michael C. Hall can play any emotion he's handed. Jennifer Carpenter fits her character perfectly, as does everyone else in the cast.
Then there's the actual story lines. It's not cliché. It's actually scary and chilling. It keeps you guessing. It's one of those mysteries that is very difficult to solve, but it still keeps your interest.
'Dexter' can also be hilarious when it wants to be, depressing when it wants to be and especially thrilling when it wants to be. And it doesn't come across as trying too hard.
Strong writing, clever dialogue, talented stars. It all makes for a wonderful TV show. Definitely the best new show of the season and will become one of the best shows of all time.