It's definitely smaller than
Oblivion, but don't make the mistake of thinking it small. Sheer size has diminished, but quality (in comparison) has shot through the roof. Everything there is to do in the game is more interesting, and even though you've only got 17 sidequests, as I mentioned earlier, there are lots of things that might have gotten quest text in other games even though in this one it just ends up being something freeform. There are countless little things.
But yeah, I've actually been shocked at just how big it is and how much there is to do compared to
Oblivion, because while at first I thought it felt smaller, I've come to feel like it's much bigger just because so little is repeated, where
Oblivion really felt like a lot of the content was filler. Filler isn't the right word since it generally seemed appropriate during the course of a normal game, but if you spent a lot of time trying to just play the hell out of it and do a lot of the content, eventually you started to get tired of certain elements. I have absolutely zero
Fallout 3 fatigue right now. I'm still rabid for it since I'm still seeing new things on a regular basis with very little repetition. I guess I wouldn't have minded a couple more enemy types, but I'm not complaining.
And that's awesome to see my mod mentioned on that page. Thanks for linking me to it, X. The positive comments I've gotten make me really happy. I only wish the tweak page actually reported the mod's functionality properly, as it only replaces a few tracks -- the idea is to fix a couple problems and make some quality additions, helping the overall depth to be improved while keeping it balanced, not to just throw everything out and add new stuff. I should maybe email them about that. Still, they had several other choices and picked mine, so it makes me feel good to know they felt mine was the one worth mentioning.
And MyD, I didn't find enough of a difference in the MP3s from GOG and the stuff in the game to bother going through the motions of conversion. I just used the MP3s. I think they did a good job with those... one guy says his songs don't have any popping or hissing or whatever, but I don't know where there'd even have been any of that in the first place since I don't hear it in the game and the GOG MP3s are clean. Maybe some of those floating around the net are of lesser quality or something, or maybe it's easy to do a bad conversion job.
EDIT - My character has gone through a number of different phases, including the Crazy 88 phase, power armor phase, completely batshit insane phase (I kind of got pissed after this one quest and went a little crazy during my retribution), and my more normal mercenary phase. Generally I go between the power armor (I've found many kinds now) and the merc armor, usually using the hood you see me wearing with the power armor. Note also that I grew more facial hair after a while, heh.