Originally Posted by Irishdoom
I've been reading this forum pretty regularly for a few months now, and one thing a lot of people ask for that I don't quite understand is the need for full menu support, be it for Blu-ray or DVD. Is that just so you can get to special features?
Personally, I rip to ISO because I never want to access the physical disc again, and I want to be sure that I can access all content at all times, if I want to.
Besides, some of the extra material cannot be ripped by any of the rippers I've seen. Picture slideshows, for example. The "Follow the rabbit" feature on the Matrix DVDs and picture in picture features on Blu-ray are other examples. (although, it should be possible to create an mkv with both tha main and pip video-track, but I don't know of any players that supports pip). I have also been unsuccessful in my attempts to rip the MST3000-style video commentary subtitles from the Ghostbusters DVD, but maybe other rippers will be able to do it.
Many DVDs and blu-rays also use seamless branching to include multiple versions of a movie on one disc. This can be recreated with ordered chapters in mkv, but I don't know of any HW-players that supports the branching. Some windows software players support it, but it isn't always that seamless. The easy solution to this is to just rip the movie multiple times, and waste a little bit of disc space. Disc is cheap anyway, so this will usually be a "good enough" solution.
I also think the menus themselves are worth keeping in many instances. Properly designed menus set the mood for the movie, and they organize the extra material in a logical order. The appendices from the LOTR Extended Editions are examples of well designed DVD menus that's definately worth keeping.