Leonard Hofstadter (Johnny Hofstadter), an experimental physicist, and Sheldon Cooper (Jim Parsons), a theoretical physicist, are two Caltech prodigies in their twenties. Besides, they share the same apartment. One day, Penny (Kaley Cuoco), an attractive blonde with showbiz ambition who works at a Cheesecake Factory restaurant, moves in the apartment across the hall from Leonard's and Sheldon's apartment. Unlike Sheldon, who seriously lacks social skills, Leonard manages to develop a friendship between Penny and him. However, Leonard has a crush on Penny.
Obviously, The Big Bang Theory doesn't reinvent the wheel of sitcoms. This means that each episode just aims to make you laugh as much as possible. Furthermore, don't expect to see something as deep as a dramatic TV series, because the relation between the characters don't seem to evolve that much throughout the season.
Therefore, we're left with this question: why is The Big Bang Theory a must-see? Like The Tournament - a brilliant mockumentary series that tries "to do for minor hockey what Spinal Tap did for dino-rock" - manages to use in a balanced way some of the stereotypes (in this case scientific nerdness) related to the story. Indeed, the characters of Sheldon, Howard (Simon Hellberg) and Rajesh (Kunal Nayyar) embody the stereotypes to our great pleasure. As for Leonard, while he has the flaws of some real-life nerds, he brings the balance. Obviously, this is because the script always manages to make us cling to the hope that the future holds good things for him regarding his relation with women (namely Penny).
Besides, although The Big Bang Theory doesn't have the dramatic depth of - let's say - Six Feet Under or Terminal City, there's nothing to reproach to the cast's comedic performance. For that matter, my two thumbs up go to Simon Hellberg and Jim Parsons for being too hilarious in their own way. As for Kaley Cuoco, I think my English vocabulary is not broad enough to describe you how much I find her so gorgeous. Besides, liking her performance, I also was happy to learn that she plays tennis. Anyway, I'm digressing. In short, The Big Bang Theory is not my cup of tea, but had it not been because of the cast's collective performance and the balance in the script, I'd have dropped the show earlier.