I can't speak for the ugliness, but as for the slow to react...
I think the reason it feels sluggish are two reasons: The screen technology has a slow response time. This is alittle difficult to fix, due to the nature of the technology: an electic field turns on or off causing tiny balls to be pulled to the top or bottom of the screen causing light to be reflected/absorbed. Due to the size of these balls (microns), it can take much longer to reorient these balls then the molecules in liquid crystal (nanometers).
The other reason it probably feels sluggish is that the processor is a little slow. Fortunately, amazon has been able to work around this a bit by caching the next few pages. (But if you go backwards it can sometimes take a bit longer to load).