It seems that Chris is exaggerating a bit here.
On my second play-through, on Hard difficulty, in that end game fight which you can entirely skip with 100 in speech, the enemy was taken down by a … Hunting Shotgun.
The Shotgun Surgeon perk, slug ammo and aiming exclusively for the head.
In the first play through I had energy weapons but also 100 speech, so that fight never took place.
The DPS stat in this game is highly deceptive. The highest DPS weapons are sometimes utterly useless against armored targets, and only moderately effective even with armor piercing ammo. The Minigun, for example, and indeed all kinds of rapid fire but low single bullet/beam damage weapons are very weak against targets with high Damage Threshold. Only 20% of the stated value gets through. Shooting a Super Mutant Master with the Light Machine Gun, for example, is just throwing away bullets.
Meanwhile, lower DPS but higher single hit weapons are very, very powerful. Which is how a Hunting Shotgun, a mid game weapon, can take down the final enemy in the game. It does 78 damage per slug at 100 Guns, and ignores 10 of an enemy’s Damage Threshold (thanks to the Surgeon perk). A few of those to the head - the least well armored part on an enemy typically - and anything goes down fast.
In fact, the combat in New Vegas is so easy one doesn’t need things like a Riot Shotgun, Anti-Material Rifle, Brush Gun or Plasma Caster. The game can be completed with Hunting Rifles/Shotguns or Tribeam Laser Rifles. Mid game and quite prevalent weapons.
This is of course if you’re good at shooting heads, in VATS and outside of it. Otherwise you’ll always be scratching the enemy’s armor if not shooting exclusively for the vulnerable, low armored spots.
And if anything the combat becomes too easy when packing weapons like the Riot Shotgun, Brush Gun or the Plasma Caster. Hell with the Riot Shotgun one doesn’t even need VATS. Just point at the enemy’s head and keep pressing the fire button.
Right now on my 3rd (and likely last) play-through I’m trying out explosives. We’ll see how that goes relative to the (arguably) overpowered guns and energy weapons.