Personally, I like ultra clear, cool colors, and higher frame rate. Also, the proportions on DVDs vs Blu-ray should be the same unless the transfer was done incorrectly
As Michael Chris alluded to above, proportionality has nothing to do with the blu-ray storage format, only the authoring process the film went through for home video use. The advantage of blu-ray is
higher storage capacity which affords a
higher bitrate to the audio and visual components of the movie. This results in higher resolution, much richer colours and more audible & separated sound channels.
Theoretically, you could encode a movie at 4K for home use (4k = 4x1080p resolution = film resolution) and we would get the ``true home theatre experience as the director intended.`` However this would require much higher storage capacity than blu-ray affords (50GB dual layer).
The only solution to this is hard drives. However, even with a 1TB hard drive, you`re severely limited to the amount of 2k (bluray) content you could put on there, let alone 4k! On top of this, the physical integrity of hard drives is difficult to ensure in the long-term. Over time, hard drives become worn out, possibly get knocked around, magnetic interference, etc...
Blu-Ray on the other hand provides us a physical medium that is highly durable. It has a highly scratch-resitant coating, which if you ever buy movies previously viewed have probably noted that blu-rays NEVER are scratched, whereas DVDs and HD-DVDs often were.
Blu-rays are also portable, which due to our current Internet infrastructure is also great. Currently, and likely for the next 10-20 years, I don`t see our infrastructure going to fiber optic that will allow for high data transfer rates that HD content will need to be delivered on-demand. Blu-ray solves this issue of portability by being physicall small, capable of storing large amounts of information and being highly durable.