Glad to see you enjoying Fallout 3 VX!!!
I've done everything I think I could find to do in Megaton, and am currently having a hard time with the fire ants in Marigold Station. So far I am really enjoying Fallout 3, although I will have to agree that it is very very much like Oblivion but since most of us knew this going in that subject should be dropped so we can continue on with the game itself.
Voice acting is fairly good, character models are well done, and the enemy models when close up in VATS mode look absolutely amazing IMHO. I didn't think much of the way Vault 101 looked, but once I got outside I was impressed. The first thing you notice is the nice clear and sharp draw distances in the game, and although Fallout does suffer from the classic "brown look" overall it is an incredibly nice looking game. Combat is solid, I was afraid that in some ways I wasn't going to like the overall feel of the controls during gunplay from the videos, but am pleasantly surprised with how comfortable I am with them.
Now a few small complaints I have so far. Why is is that the entire background pauses while you are talking to an NPC? Has anyone else noticed it yet? If not, look for it, it's there. I noticed it the first time I went by the Super Duper Market and talked to one of the Ghouls. The barrell next to him was ablaze with fire moving and waving nicely in the wind when I walked up to him, and as soon as I engaged in conversation with him the blaze stood still, paused with the rest of the background. The other Ghouls around were as still as if the were engaged in a high stakes game of freeze tag. The third person view looks absolutely ridiculous, and is something that wasn't even necessary. My guy looks freaking hilarious when walking, or I should say skating across the ground. Nothing big since I prefer first person view, but hilarious none the less.
Anyway, that's what I think so far. Oh, and can someone tell me where I have to go to get the quest to arm the nuke in Megaton and blow the city to shit? In one of the videos I watched, I saw that you got this quest from some guy in a hotel not too far away since you watch the bomb go off from the balcony.