Perhaps the most mediocre of all episodes this season. It did almost nothing to advance the story of the characters' lives. This is typical of all shows that attempt this "what if" trick without telling the readers until the end. It is nothing more than "it was just a dream" except that the end of the episode loops back to the episode's opening... as if you just spent a half hour going nowhere so that the network could throw ads in your face.
All it said to me was that the writers couldn't figure out how to get Penny and Leonard back together... or not. There's something very symptomatic here, considering other shows created by Chuck Lorrie have all had a similar problem. The "couple" if together move forward learning about each other as if they never did while they date. That's liveable, since its at least interesting to see the process. If the couple is not together at the beginning of the show, chances are they never will be, because the writers appear to have very little knowledge of how that process really works... and from the shows I've watched, I don't think Chuck does either.
Don't get me. I love his work. I look for his name on any new shows coming out. But is a problem I've seen in almost every production he is involved in.