Oh my goodness I have no idea what I can say that hasn't already been said.
I am an old-fashioned die-hard fan of Wasteland, Fallout 1, Fallout 2, FOT and I've played FO3 and its expansions.
I enjoyed the FO3 game, though as everyone else has said it lacks a great deal of the "gamesas Fallout Feeling" that its predecessors had. It was still appealing though in its own right and if Fallout Online uses the same engine and graphics I would be just as pleased as I would be if they used the old 2D platform. They just have to add the real fallout feeling to make it great. I have confidence gamesas will accomplish that in far greater detail than Bethesda.
I played FO1 and then replayed it a couple times. When FO2 came out it had game mechanic improvements over FO1 like completable quests and real NPC companion diversity and NPC gear/carry weights.
After FO2 I found it hard to go back and play FO1 but I replayed FO2 quite a few times.
My fears about Fallout Online are:
1) Is it going to be a "wasteland" with a billion people clambering about out of one hole in the ground and basically "settling" the land?
I hope not. It needs to have a real wasteland feel to it, which I can only imagine would be hard to do in an MMO setting. They will definitely need a great deal of vaults or starting locations to accomplish it.
That or make it diverse! Some people can emerge from a vault, some can wake up with amnesia in a random hospital flat in the world. And even possibly some can be born in the wasteland or mutated from pre-fallout.
2) It's got to have real pvp (I hope). And I don't mean that bogus WoW pvp where there is no real loss. This is a wasteland people! And especially not that nonsense that Fallen Earth tries to give to people with PVP zones... Bleagh!
3) This might be an issue early on but could easily be fixed with time and patches/additions. It's really going to have to encompass a very large area of land to get a true wasteland feel. Ofcourse there will be junktowns with large populous of players and npcs but the general wasteland needs to have a huge abandoned feel short of you being out there and any party you bring along, and perhaps a random passerby/party on occasion.
I can't wait... Don't let me down gamesas I have faith in you and your development crew!!
The pressure is on
-Kain