At all 4 showings i went to so far for TLJ, every joke got a laugh. Not just by one or two, but by most attending. At the midnight showing, the laughs were louder because the cinema was packed, same with the second showing. When the cinema is less packed the laughter can be quieter or when there are not many in there, people can be a little self conscious and tend not to laugh as much or as loudly, if at all. Happens with every film. The jokes in TLJ worked perfectly fine.
One thing i have to say since seeing the 2D presentation though is, i take back everything i said about Yoda. What the hell did they do in the 3D conversion? Did they overscrub the grain or something? Yoda, in the 3D presentations looked very smooth and almost waxy. Yet the 2D showing he looked amazing. Just like ESB Yoda. The only thing i noticed was the the puppeteer closed the mouth too tight and caused the face to squash, giving it a strange puffy look a couple of times. But that was the only thing that looked off in the 2D showing. In fact , effects wise, the whole film looked better in 2D