As the title says if I am not using guns is repair necessary?

Keep in mind that other items do degrade (ie clothing, armor, unarmed weapons, melee weapons, etc.)

It's not necessary but there are other things to repair other than guns

It has several uses besides ammo and weapon repair, can help for quest shortcuts and stuff, but otherwise it isn't too important, since you can repair weapons to full at any level now. Just put in a couple points every level.

no matter what you use to fight with, except your natural fists, will degrade.

Melee weapons, guns, energy weapons. Unless you're using your fists and grenades alone, you're going to have to repair eventually.

As mentioned, everything that isn't ya bare fist usually deteriorate. A few number into that skill and/or a handful of that magazine Fixin' Things wouldn't hurt. Ya can also have someone repair ya stuff for a fee, of course.

pretty much most items will degrade. wheither its armor, energy weps, melee, or Brass knuckles.

Having a certain number in your repair skill sometimes gives you repair dialogue for some quests.

As far as I have been able to tell, the repair skill only matter when it comes to crafting items from the reload bench and some items from the work bench. In this game, your actual repair skill doesn't do anything beyond unlocking recipes for these two things. Even with a repair skill of 16 I can still repair all my energy weapons up to full if I want. The only thing that actually effects the amount repaired when you do the repairs is the condition of the item you're using to repair it with.

I LOVE repair so I always max it.

That being said, I would advise that you put it at at least 50. It will make repairs that you do do for your weapons and armor more effective and you will be able to craft weapon repair kits. (which are awesome and will save you a butt-load of caps)

Yup....you cannot pay people to do repairs on armor.

Also, if you're into looting victims to sell loot, repairing their weaponry (with a decent repair skill) will lighten your load while not really reducing the amount of money you can sell them for.