Hurr Durr Derp said:
The poll isn't invalid because they didn't play the older ones enough, but because they didn't play them at all. You can't say that apple pie tastes better than blueberry pie if you've never even had blueberry pie.
Bingo, it'd be like asking which Bungie game do you like more. Marathon or Halo?
Most of the posters here are young and as such didn't get to play Fallout back when it was still new. If they tried to now, they'd probably hate them just because they're not all super flashy and shiny with the latest Gigatessafloppydoohicky rendering and are slow paced with a totally different feel gameplay wise. Isometric turn based combat versus first person shooty shoot, it's not hard to see why people today may not like the original fallouts.
It's a bogus poll and unless you can whittle it down to only asking people who actually got to play the series from the start back when they were new, you're going to get a huge skew towards Fallout 3 just cause most gamers haven't even played Fallout 1 and 2.
Case in point:
An OXM editor that refers to Fallout 3 as the "original" and has absolutely no idea who Obsidian is. These are the sort of people who will be answering this poll.