Only played Fallout 3 which I enjoyed.
Heard New Vegas was trash so I didn't touch it.
Haven't heard anything good about Fallout 4 either..
Should I revisit one of the earlier ones?
They're very different from Fallout 3, New Vegas, and beyond, as they're isometric RPGs. Fallout 2 has one of the worst starts for a game. But if you can deal with that, you'll be in for a treat. I've played the shit out of Fallout 2, it's one of my favorite games ever. Get the first game for cheap, and give it a try and see if you like it.
I loved New Vegas because of the setting, and the connections with the earlier games in the series. If you liked Fallout 3, I can't think of a reason for you not to play it. It's pretty much the same game, only better linked, in a more fun and colorful setting. Play it, I guarantee you'll like it.
Recently, I was looking at Fallout: Brotherhood of Steel footage. It's one weird and underwhelming game. Has anyone played it?