Trying to get to Rivet City myself now, but its a bitch to get to. Made it to level 11 last night as was able to jump two levels in one go, which means more health and can do more damage (and I am still having trouble making it through certain parts).
I love the minigun, but with even my big gun skills upgraded, its still pretty useless if you try to use it in VATS mode. By far my most useful weapon so far, is the old trusty hunting rifle. The damage isnt the greatest, but the accuracy is brilliant.
The Flamer (no not Rob) is a fun little weapon as well.
If you go to the museum of history, you can accept an assassins contract, and get handed a rather nice sniper rifle. I also marks an area on the map called The Republic of Dave, which I am sure will be filled with all the poo you can eat.
I have found its certainly worth doing all the side missions for Moira as this can get you some easy XP and ammunition etc!
