Hi,
Not having owned many DVD players in my time, I was wondering if anyone could tell me whether the DVD Player.app with Mountain Lion is actually of comparable quality to a decent DVD player? Are there any DVD player applications for the Mac that have been shown to offer higher-quality video playback?
If you are talking about software - there are many players and some have features others do not. The dvd.app is a fine player for the computer screen. Also VLC, mplayer for Mac, Plex, XBMC, and a couple of others.
Unfortunately, some people consider just resolution to be the issue/solution when there are other facets to include such as some dvd material that is not progressive and requires some adjustments to view without the break up zigzags etc. VLC as example does this well enough and so does PLEX and XBMC.
If you are planning to use your Mac with a TV, I suggest you look at PLEX and XBMC. They both offer some additional tweaks as well as a nice interface. Both are free software.
Btw, it will be years before media discs are entirely obsolete (if at all). Those that suggest its early demise are just silly. Given that millions of DVD and Blu ray are sold and rented the facts suggest that while companies are pushing streaming, the disc is still here to stay for a few years at minimum.