You don't really need to talk about South Park at length now, do you? It's been a huge success ever since day one. When it debuted way back in 1997, people were all over it from the get-go. Earlier episodes do not have the same feel, by the way. Some prefer how it was before, but majority of people agree that with every single season, South Park just keeps on miraculously getting better and better.
Don't let its simple premise fool you. It reads as four young boys and their bizarre adventures in a small Colorado town. South Park is famous for its clever use of satire, profanity, dark humor, surreal humor and patronizing speeches. Nothing is off limits. Scientology, Tom Cruise, political correctness, racism, gender issues, Jesus and his friends, every-freaking-thing. If you are new to this, it's a good idea to not start from the first season. You can even jump to the latest one and still enjoy the hell out of it. Without any further ado: just enjoy it, it's 100% free to watch and download.