Played this game up to lvl 16 with a char now. I like it as well, but I find myself lacking in motivation sometimes when I play it. It really never catches me totally. In Oblivion I had a blast just exploring the lands, the caves and the ancient ruins. In Fallout 3 I just dont feel like doing it since, well, 8/10 times I come out of the sewer/metro/abandoned factory with less -ammo- that I went in with. And ammo is a big deal in Fallout 3, it was never such a big deal in Oblivion since, well, you had a sword. It gets better later on though with ammo being a little easier to find.
Other things that bug me it the sometimes inconsistant dialouge. I play a female char and have on several occasion been adressed as "Guy" or "Him". The NPCs give me the feeling of, despite Bethestas best efforts, being Zombies. Mostly because they respond in such a scripted fashion. Just moving your targeting reticle over a locked box yields the dialouge: "I see you eyeing that, are we gonna have a problem" or "Yes that is locked, and yes I can see you eyeing it". Diversity in items is also wierd. I still run around with the same assault rifle I found at lower lvls.
The gore is hilarious from time to time. I shout someone in the head with a 10mm round, it flies off...ok cool. I shot the same type of mob in the head with a combat shotgun, it flies of...oook. 100 times later its still the same thing. It should be called Falloff in reference to the heads.
This being said though and its always easy to find the negative aspects, it really in my opinion catches the Fallout feeling. Not the gameplay feeling, since its a totally different game. But the Fallout feeling, the world, the alternate future, all the items from the pipboy to the cars, weapons, foodstuffs etc etc. Its all there in a new suite and it looks great and feels spot on. Its probably this that keeps me playing it. To stand in the wasteland, with Three-Dog on the radio. Hearing both his preaches of "The good fight" while the ashes blow in the wind. I still unhook the Hunting Rifle and go explore. For an hour or so...that is.