I am currently teetering on the abyss of liking this show. Any encouraging words to help me make the leap into fandom?

Due to my brother's new-found obsession with this show, I find myself constantly exposed to it each night while eating dinner. Gradually, the characters have worked their way into my consciousness ( even Sheldon! ) and I'm not quite sure that I want them to leave. Besides, the theme tune is so frickin' catchy!