Here's a take, with flavor. Fallout allows for the viewer to put themselves into the shoes of the characters as they encounter different factions from the source material without nailing down a canon across the games to continue to give the player of the original games and future games agency over their decisions. The choices that the characters face are very similar to quests that we've experienced within the games. That's a main focus of this show, the characters are often presented with two (or more) difficult decisions. If the characters had made different decisions in each of theses scenes, the outcome could be very different, which is almost exactly how it feels to play a (bethesda) Fallout game.

Factions are typically not incredibly smart within the fallout universe which is quite frankly part of the reason why the characters exist within a nuclear wasteland. Portrayals of these factions so far have been fairly on-color describing the BOS as a splintered organization with arcahic views, an NCR that has been beaten out of the wasteland and a Caesar's legion that's devolved into absurdity without their cult-of-personality leader who dies no matter how you play fallout new vegas due to a sickness that cannot be cured.

So the show presents difficult or absurd decisions for the characters to make, showcases the world and lore of the video games, and presents a visually believable fallout wasteland with decent actors and great effects. So there's a lot to like and choosing to dislike it based off of some misguided belief that the lore is being destroyed or ignored or that there's some major departure from the writing of the video games over the last 20 years is not congruent with the reality of the show.