I don't think he got drugged when he was drinking Sake, I think he got drugged by that little scratch the wench made on his arm right as he shoved her away. I could be wrong though.

And ya I have to agree, it had a really terrible beginning but I have to admit this arc is progressing fairly well as an interesting arc. I am curious to see what Sakura will pull out of her ass to not get herself killed there. It would be interesting to see if Orochimaru makes Sasuke fight Sakura, that was who I was half expecting her to see instead of Kabuto anyway.