Jidai Geki
It Wandered In From the Wastes
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And sadly that is the issue with Fallout 3 as it was made for people in mind that liked Fallout for the setting. Not the mechanics behind it or the gameplay in the first place.
I disagree; it wasn't even made with that simple concept in mind. Bethsoft repeatedly stated they would be making 'their' RPG with FO3, and the result, whilst faithful in some areas, deviates in many places in order to sanitise and simplify things (psychotic cannibalistic raiders, uniformly evil supermutants, 'noble' Brotherhood etc. etc.).
That aside, I consider myself one of the Fallout fans that places the setting as a high priority, although after FO3 I have come to appreciate choice/consequence mechanics and well-written dialogue a bit more. The demise of TB combat would not have bothered me so much had the RTwP been implemented in a much better way, viz. not so ridiculously easy. I'm playing through with a character who's heavy on non-combat (tagged science and speech; 30% small guns is her best weapon skill) and she's mowing supermutants down routinely.
I don't consider it a terrible game, however, despite what the above may suggest. It's fairly entertaining, if not something that will still hold my attention in ten years in the same way the originals still do.