Fallout: A Post Nuclear Role Playing Game

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Dude, it's an RPG. You're not supposed to play somebody else's character. But, if you want a seriously overpowered character you should:

max out your perception and agility
spend points on small guns and repair (trust me, you are so going to regret not putting points into repair)
take bloody mess (unless you don't want an awesome experience) and finesse (or whatever suits you)
get the sniper rifle when you are given the choice
always aim for the eyes

This is the most overpowered build I've tried so far. Miniguns deal more damage but are not as precise and the bullets are expensive as hell. With this build you can deal 200-250 crits easily, even on supermutants.

EDIT: In case you didn't know, aiming for the eyes with maxed out perception is always deadly. I tried out a guy that used only throwing knives and a shotgun when they ran out and I got through most of the game without even breaking a sweat. With a high perception, any projectile aimed at the eyes is almost guaranteed to blind the enemy which always results in victory. The crits for throwing knives are ridiculously small, only like 50 points, but the tradeoff is you can usually throw two or three each round.