"Some folks claim not to believe in luck, but when they lose in a duel you'll hear them say, 'That lucky son-of-a-gun!'"
Doesn't the loser of a duel often die? Anyways... Luck is a great skill, especially with poor Intelligence suffering. From Luck you will get a half-point bonus to all your skills (rounded up), which tops out at +5 once you have nine Luck, making nine really the terminal score for Luck. Considering this, Luck can potentially give you the highest skill bonus of any attribute, and the fact that each point also translates to your critical hit chance makes it a very nice attribute indeed.
|Luck||Critical Hit Chance||Skills||Description|
|1||1%||+1||13 Pitch-Black Coats|
|2||2%||+1||Broken Gypsy Mirror|
|10||10%||+5||Two-Headed Coin Flip|
You can increase your Luck by one point by getting the Luck Implant perk from the New Vegas Medical Clinic.
Start out with eight Luck and bring it up to nine with the Implant, which is as high as it needs to be. Even the critical-hit happy builds should be satisfied with this, as it's not worth stripping a point from another S.P.E.C.I.A.L. Attribute for one measly point of critical hit percentage.