Well, for the issues of whether you would like it or not, you could always rent it first.
And then for the time commitment, well, just learn to have some self-control. You can leave the game and it'll be there waiting for you whenever you get back to it. And as for cutting into your Oblivion time? Dude, 4000 hours is plenty. I find it hard to believe that after that long you don't want to spend some time on some other games.
I think Fallout 3 is fantastic and everyone should at least try it. I never played Oblivion, but I don't think I'd like it very much (I did play Morrowind and liked it pretty well. Oblivion just looks way too Tolkienesque generic. At least Morrowind had giant bugs and other semi-exotic stuff to make it stand out).
And then for the time commitment, well, just learn to have some self-control. You can leave the game and it'll be there waiting for you whenever you get back to it. And as for cutting into your Oblivion time? Dude, 4000 hours is plenty. I find it hard to believe that after that long you don't want to spend some time on some other games.
I think Fallout 3 is fantastic and everyone should at least try it. I never played Oblivion, but I don't think I'd like it very much (I did play Morrowind and liked it pretty well. Oblivion just looks way too Tolkienesque generic. At least Morrowind had giant bugs and other semi-exotic stuff to make it stand out).