It depends on the job of the PowerPoint. If it's going to be saved and used by some people as a reference later it's usually better to have busy slides that contain the info that needs to be presented and just skip over the unnecessary verbosity by only highlighting key points.

If you're trying to pitch someone on why your redundant project shouldn't be canned then you should probably keep the slides simple and to the point and add in any extra stuff you need in the delivery of the presentation.