weker:
FO3 is a awesome game its just buggy most of dlc where good and when i say what is unbalanced i would like you to be more specific.
I can try listing what I found in it that was poorly done.
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Weapons
Weapon ranges,ammo, damage,ect are all over the place the pacing on the weapons themselves is poor you need a generic level like whats in the game then 2 more levels of weapons where the weapon say the 10MM Pistol has the generic rusty version, restored version that is more accurate and dose more damage and a customized version that is even more so then of coarse after this the unique weapons that only have one version of in the game. The melee weapons are also poor there needs to be a better version of each and they all should have more tweaked reaches and damages,ect.
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Toolbench
The whole have blue print you can make stuff is nice but like the magic pot on DQ7 you can only make 10 things with it there's no real customization you should be able to get alot more out of it and make 2 or 3 versions of the weapons you build with new blue prints of coarse.
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Equipment/items
Like the weapons very very under utilized you simply need 2 or 3 types of each and be able to stack some of them, as well as build and tweak them on the toolbench.
Oh gawd how they under did jet..it should be a slow time+ speed modifier and vat point tippler.... other stuff is under done and poorly done as well....
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Radiation
Radiation only effects the player its not a mechanic the whole game uses its just something for the AI/items/enviroment to use against the player. And because of that another fasit of the game is shallow and craptastic.
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Vats
Ranges, points used its all just crap rushed there's no polish or refinement its a stale bone they threw at older FO fans....
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Skills/EXP
Being limited to 100 for one them going up a bit to quickly for 2. Past 100 you should be able to raise them at a 10 to 1 ratio with a cap of 30 skill points a level, and levels continue forever they just get farer and fewer between, at lvl 30 you need to gain all the EXP you needed to get to 30 to get to 31 and the same for 32. or something like that the way they did it purely sucks.
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Perks
I wish they had a perk where you can add 5 levels to your level for the perpouse of getting preks...but thats pretty much it... I think.
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Level design
Its a bit bland for the size of it they did a good job at hiding things I guess over all it has better level layout than any other shooter. Still its a minor annoyance the invisi walls and stuff...
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Basically items+ gameplay is solid for 5-10 hours then falls apart like crazy because they were to busy wanking off on the the DLC.
And this is more or less true of Bioshock only add in its short and easy....