Have you seen the unaired pilot? The very first version of the pilot, before Kaley Cuoco.
I think we went near a real disaster (maybe not near, as the pilot was not accepted!). That was awful. First, it was way darker. Then, you realize how Kaley Cuoco is important. The previous actress was not good, and her character was wwaayy different. She was just here to take advantage of the boys, while the new Penny has true kindness for them and is just sweet.
I think it's a bless it was refused!