The original trilogy still looks great, its effects are dated, but they looked damn good for their time, and still hold up quite well. If kids are not laughing at the OT today, they aren't going to be. None of the effects are really all that laughable. The thing was built to last, and it shows.
The SE however, has already had to under go a refit. And will under go another no doubt before its eventual Blu-ray release. I concede that if kids are watching the crappy CG graphics of a SE that hasn't recently been redone, they might laugh.