goducks28 - "enhancements" modify the source. Since this is a digital set, it should faithfully reproduce the signal it's getting. There are basic settings that need to be calibrated - brightness (for black level), picture or contrast (for white level), color saturation and hue. But "enhancements" process (distort) the original signal. Unnatural pictures such a Vivid can initally impress, but typically become tiresome and annoying w/ their distorting side-effects.
Why do sets have these "features"? Because they draw people in (as flashy vivid settings do on a showroom), sound hi-tech and can fetch a premium price. It's trivial to throw in some signal processing code, and very rewarding to a manufacturer's bottom line. Most people, esp. when hdtv naive, will go for the flash and look past a set w/ a clean, natural picture.
Re: jumpiness w/ a fast scroll... that's certainly in the source itself. These motion problems are common in source material, yet most immediately think it's their set. The weak link in the HDTV chain is source material not these latest generation sets. Film is 24 fps. You can't pan a film camera w/out blur at that rate. Digital broadcasts are also of very mixed quality. One shot will look great during a football game, and w/ a switch to another camera the picture looks crappy. Then there's compression artifacts and so on.
When there's bad PQ, one should look to source, settings ("enhancements"!) and connection -- it's rarely a high quality HDTV.