A lot of things have changed in video games since the last Fallout, not least of all the way branching dialogue works. Telltale Games and their Walking Dead series has allowed players to make choices that actually affect how the story moves forward, and the likes of Mass Effect and Dragon Age's dialogue choices change relationships with NPCs too. All of which makes the dialogue in past Fallouts seem rather lacking in comparison. In those you could be a total d*ck to someone, then come back later and be presented with the exact same dialogue options as before. Even if you, say, killed their mayor. The fourth instalment hopes to change that with something called dynamic dialogue. That means, presumably, all of those previous problems will be moot, and they'll follow the mould of modern dialogue systems. With the presence of a talking protagonist and hundreds of NPCs, however, that means Bethesda are leaning rather heavily on the voice cast to do a lot of work. Even flat acting could totally scupper anything cool about it.
Tom Baker is the Comics Editor at WhatCulture! He's heard all the Doctor Who jokes, but not many about Randall and Hopkirk. He also blogs at http://communibearsilostate.wordpress.com/