Big Bang Theory hasn't started all that great this season in my opinion. The epsides so far have been forgettable, and most of the laughs they have been getting have been quite cheap.
In that respect, tonight's episodes wasn't any different, only thing is that they were funnier. Sheldon, like Alan on two and a half men, has practically become a cartoon character. Saying that these two characters are keeping both series somewhat enjoyable right now.
Sheldon's halloween plot line was funny, nothing particularly spectacular, but they got a couple of laughs out of me.
The rating of the episode suffered a bit due to Leonard's storyline. I liked the opening part of his storyline in the Comic book store, but the rest wasn't that interesting IMO.