Kathleen Turner and Dennis Quaid have charisma and they really work exceptionally well together making it a pleasure to watch.
And it's really that charisma that supports a ridiculous plot with jokes that, honestly, wouldn't have landed at all had they been delivered by lesser actors. They bring a hilarity to a film that would otherwise be standard early 90s flop fair, and they are consistent enough to make it enjoyable from start to finish.
So, it's not a great film, but it is entertaining and that was the point of making it in the first place. So, watch it, you'll be entertained, and really, that is the only reason why you would pick up a film like this anyway.