But even then they reuse the same old interactions and "jokes" all the time.
Raj with his "gay" and unmanly characteristics.
Penny with the "blonde dumbie" character.
Sheldon with his "I am better than you" character.
Its just that the jokes and the interactions are repeating themselves.
Like I said. To me its mindless entertainment. But I wouldnt really call the interactions between the characters a highlight of the show, since after a few episodes nothing really changes between them and at that point you kinda notice its just an ordinary sitcom.
it's what characterizes them.
The characters would be insipid on a comedy show if they didn't stick to their charactereristics.
Sure, through the seasons you'll see an evolution of the characters but every now and then, they show an hint of what they were.
Howard was a sarcastic creepy nerd. He's now just a sarcastic nerd. The show dropped the creepiness or atleast toned it down a few notches once he married Bernadette.
And if you see nothing changing between the characters, you haven't paid attention.
Sheldon is a lot more human now then he was in the first seasons. He has even kissed Amy, something deemed impossible on a character that was incapable of even thinking that he was about to be hugged by a friend.