What matters, is: - Well designed character systems (that heavily governs combat efficiency, world interactions, NPC interactions, the PC's miscellaneous traits), - Sufficiently mature and largely player driven branching narrative and side content - Multipath/multisolution quests and stories - Choices and consequences, cause and effect, reactivity; smaller and larger scale, immediate and more down the line - Highly reactive ending slides (and a proper ending to the game) - Player accountability to his actions - Turnbased combat (that's preferably tactical but not too heavy handed - e.g. Jagged Alliance 2 level of depth might be unfit for the purpose, good as it might be in that game - there is a balance to be found) - Gameplay and content focus spread evenly enough so that no single feature (e.g. combat) outright overshadows other forms of gameplay - All that happening in a setting that makes sense within the context of the Fallout fiction (as originally envisioned) What doesn't really matter, or is secondary, is: - Whether or not it is straight linked to past games (through recurring enemies and factions and telltales) in the series. I would prefer a nigh complete detachment from the past. - The perspective. Cavalier oblique or ISO would be preferred, but if the gameplay and character systems work well, it doesn't matter all that much. The game could well be modeled after Witcher 1, Kotor 2, Wizardry 8, or even Dreamweb or the B.A.T. series from the days of yore. Just as long as it's turnbased and systems heavy in a similiar fashion to the original two games.