They are. Like, by definition they are. The plot holes they create are just something that you'll have to make up excuses for on your own or just ignore them which I think is best to do with everything in EVERY Fallout Game due to their nature. They're all basically broad strokes canon anyway. Do I think they're worse than the West Coast games? Of course. Especially in terms of story telling, role playing, and balance features. I would say they're even better at creating enticement for exploration which is something Bethesda generally /does/ do well. But really it doesn't matter what I /think./ Fallout 3 and 4 are canon. But all you'll ever really HAVE to accept are vague broad strokes.