Amy was the best addition to the show by far, her expressions and mannerisms are just comedy gold. The original pilot is very weird, I think in the first scene Sheldon is at a sperm bank making a donation to cover rent money. like wtf...
And yeah, this is the show I watch as an "appetizer" for the rest of the thursday night lineup. My favorite things in the show are all the cool nerdy guest stars, like most of the cast of TNG so far or Starbuck or Buzz Aldrin. Me and my friends growing up were pretty much like these guys, clueless about girls and endlessly debating Trek, D&D, Star Wars, etc trivia, having a twice-weekly comic book store visit, even having an Indian guy. They have definitely pulled back on the nerdy humor in the past few years and gone broader, especially relationship stuff, oh well.
I was really suprised at how popular this show was, but then I realized my mom, sister, inlaws, etc all watched it because they all had nerds like me growing up around them, so they enjoy it for nostalgia and stuff. I can see how people who hate laugh tracks hate it, and nowadays it has very few real nerd moments anymore, but the characters for the most part are likeable and its nice to see the interactions. The women are much better and interesting than the guys though, the guys have all kinda become 1-dimensional and boring.
It is weird to see some of you say that this is the only american comedy you watch. I would rate 30 Rock, Archer, Parks & Rec, Don't Trust the Bitch, Happy Endings, and a few other shows way above this. But then again I still watch shit like Office so what the fuck do I know. Community is a whole nother debate, and becomes a "art vs reaching the masses" kinda thing.