Exactly. There is no selection of which deserves it.

This. All of them needs to be preserved.

I came here to say this exact same thing. Videogames are an art form, and the history of that art should be preserved, both the successes and the failures. People should be able to look back on what was a hit and what was flop, on the ideas that worked and the ones that didn't, on the well made games and the badly made games. All of it matters, all of it is part of the same story.