LAER is a great gun, but it'd only be useful for someone who can stand to repair it as often as required.
Jury Rigging would help, so would high repair and a lot of repair kits. Traveling with Raul will also help extend it's life.
As it turns out though, the Gauss Rifle (and the YCS/186) has superior damage per hit and superior DPS (though I doubt the superior DPS holds true for a character with low agility). The only downside to the Gauss rifle is that if you're playing on hardcoe mode, you can really only carry around so many shots. 5 Microfusion cells = one shot, and that's .5 pounds per shot (without Pack Rat).
It's a matter of preference really: Would you rather deal with ridiculous repair hassles or ridiculous ammo hassles.