First I love the change after the "end" from Fallout 3, I don't explore all the D.C. but I travel back to Jefferson Memorial and see changes in game, this is a good point for next games or dlcs (To bad we can't play Fallout NV after the end and see the changes if you support Dr.House, The Republic or the Legion, or becoming the King of New Vegas! if you support a free New Vegas).
The next step is a good introduction, from the three games Fallout 3 wins (in my opinion) the tutorial is excellent, but I love the factions and Fallout NV wins with this, Skyrim have factions but they are small or normal, nothing changes if you play for one band or another one... I know we can play for the Imperial Legion or Stormcloacks but there are minor changes when one wins, like Dawnguard dlc.
Another points to say are the option in Fallout NV to modding weapons, I wanna see this in Skyrim but I think magic do something similar. But if we love playing Skyrim isn't great to see something like SPECIAL in Skyrim? Surelly i think!
For first time I see Hearthfire in Fallout 3 lol, when you buy a house and can make changes on it. Well, that's all people, I made this topic because I was very enthusiastic about playing this great game, I know Fallout 3 and Skyrim are from Bethesda, Fallout NV not, like TES Online (In my opinion, I played these games like another great game like Dishonored and play alone, only used companions in minor occasions) so I don't think I'm going to play TES Online when came up... And for last I see most people from the forum talking about the developers and their respective games and the difference from Bethesda but this forum from Bethesda has all these games so enjoy it!