Honestly, Fallout 3 Had great story telling to me, some VERY addictive gameplay, and was all in all heavily polished. It was so fun finding the little details, easter eggs, and quests hidden about. I see everyone who calls it poor in any catergory (Save for an ending narroration, that I will admit seemed whipped up last second) I feel is just trying to be "That guy" you know who I am talking about. THAT GUY. The one who sits at a card shop calling your 1st turn kill deck overrated. THAT GUY who claims citizen kane and Casablanca are overrated, outdated garbage. THAT GUY, who just says things mainly to appeal to the easily lead, overly opinionated "Alternative" crowd.
The only 2 complaints I ever had about Fallout 3 were as followed... 1. To little command ability over your allies. I can't order them to run from death claws and fight everything else. 2. When you first talk to that Ghoul in Megaton... you automatically know he's a ghoul. That shouldn't be so.
And those are just minor nit picks.
On Topic Though: Mod's make ANY game better. Morrowind with it's Vampiric Embrace Mod III for example, Oblivion with the OOO mod. And sadly I am bogged down with the console version of Fo3 because I can't afford to upgrade my processor to play it on PC so I don't get the great mods available for the PC version. All I know is, Mod's make ANY game better. The more modability, the better the game.