I don't think anyone really cares about the NES games beyond historical curiosity, and in terms of emulation they're obviously fine. But a lot of people are going to overlook the digital graphic novels, and I think they're pretty interesting in their own right.
The first DGN was originally released on the PSP, and back then I remember not really getting into it because of both the presentation (it had music and sound effects, but no voice acting, which was later added when it was made into a 'movie' for the Legacy Collection) and the fact that at the time it was being billed as a replacement for playing MGS1, despite it obviously making a lot of heavy story cuts to fit into a 2 hour runtime. But reapproaching it now on its own merits, a lot of the story changes are pretty clever, and you can tell the writer really understood the assignment as well as the series as a whole up to that point. Some changes are made to layer the story over itself to shorten the runtime and some are just there to help the story mesh with the series narrative at the time, like finally correcting Dr. Clark's identity or trying to reconcile Gray Fox's personality with his other more current incarnations. For every scene that doesn't make the cut, you get new scenes that show the rest of the game's cast in new lights that make it really fun to watch for returning players, and Ashley Wood's art (the artist of both comics, as well as Portable Ops and some of Peace Walker's cutscenes) is as great as ever. The voice acting still doesn't really live up to the original MGS1 performance, keeping the Twin Snakes accents, and David Hayter tries and fails to not constantly slip into his MGS4 Snake voice for most of the runtime, but they benefit from a tightly paced script.
MGS2's digital graphic novel was only released in English for the first time when the legacy collection released, and until the master collection that was its only release to my knowledge. Despite being nearly an hour longer than the first DGN, it feels like it still manages to tell half the story, and spends most of its time dragging on with things that don't matter half as much as what it cuts. Where the first DGN felt like its writer knew the story well enough to be able to condense it in ways that make sense, this one feels like it was written by someone who at worst didn't understand MGS2's story to begin with, and at best was one of the many people who just really hated Raiden. The whole story is basically MGS2 if Snake was still the main character throughout it, dropping the majority of the metacontext in favor of giving most of Raiden's battles to Snake while also pretty much just rewriting Raiden's entire personality into a cool, snarky side character. Rose and Campbell are barely present, the Patriots' plans are poorly explained at best, almost all of the Tanker incident is saved for flashbacks over halfway in, and instead most of the story just tries to rewrite the Big Shell incident as if it were another regular Shadow Moses incident with nothing strange going on. There are some cool changes here and there, and one in particular gave me a little bit of goodwill towards it, but I think in general this has the same appeal as The Twin Snakes in that it's fun to watch for the sake of seeing how funny it can be at its worst points. Ashley Wood's art is still cool to see, even if it feels a bit rushed compared to the original (and you can clearly see their priority in characters; Raiden basically never looks like Raiden in favor of looking more like Ocelot without a mustache, which is honestly fair since comic Raiden never really acts like Raiden either)
There are some technical oddities here and there, like both videos being far larger in file size than they probably should be for what are still somewhat low res videos (which is fine; the first one honestly looks a lot better than I would have accepted from something upscaled from the PSP) with only one audio track each. I could also see people being disappointed that the first DGN is the video version from the legacy collection, rather than a port of the PSP game with its small amount of interactivity, but as someone who played it on the PSP it flows much better as a movie anyways. I don't know how many people will ever come looking for these, since even now a huge amount of the fanbase even misses out on full games like Portable Ops (PO/PO+/Acid/Acid2 MC vol. 3, konami, make it happen) but I think these are very worthwhile bonus content, and I'm glad they're in here.
