I like the interaction...the guilds, the roleplay, etc, so I'm comfortable playing MMOs in general. However, for me, the key to MMOs is how well the mechanics work, specifically the class structure. What might make a Fallout MMO interesting is that Fallout is a classless system, so that I would be able to build the type of character I'd like to play...and not conform to a prebuilt character class. If they do SPECIAL right, a Fallout MMO could be very interesting.
Oh, absolutely. But I'm coming from an MMO (EVE Online) that already had extremely well thought-out player interaction built right into the game, for one. (All players were on the same "realm," and every single item in the game was made and distributed by other players. You needed people to mine the ore to sell to other players who refined it, who passed it on to other players to build it into something and sell that. Plus you needed "truckers" to distribute all this stuff at each stage. Add in that the more valuable and useful ores were usually in zones where PVP was free and openly encouraged, and you had an extreme influence towards building up relationships with other players.) I had a lot of fun in that game building trust with a core circle of friends I met in the game, planning the logistics of making mining runs into hostile territories, eventually forming ourselves into a corporation, bidding with various mercenary factions for protection, etc.
That game also was totally classless, and there's like hundreds of skills to select from (and in an interesting turn, you earn XP at a set rate per hour - regardless of whether you are online or not. So one skill might take 45 minutes to get to level 1, another might take over a month to get from level 3 to 4.)
So I'm already experienced with very deep game mechanics (in the tutorial, it's about half an hour before they even get around to telling you how to pilot your spaceship
), extensive player interactions, etc.
So yeah... a Fallout MMO would have to be pretty deep and compelling to get me interested. I'm going to be interested to see what it turns out like, I might even play a free trial just to check it out. But if EVE wasn't enough to keep me going at this point, I don't hold out any hopes for Fallout, either.
(Honestly, MMO's just became too much of a time investment, for me. I don't find them very compelling until you start interacting with and meeting other players, and once you get that going it leads to responsibilities and such. It got to where I had at least two hours out of every day set aside for that game. Nothing inherently wrong with that, but I just can't do that sort of thing anymore.)