As does the sword, shotgun, scattershot, hammer, and every other power weapon in the game. If anything, the Boltshot discourages campers, since now anyone can approach them with a default loadout and make them pay. I recall some Rampages in Halo: Reach's Construct map where whomever had the shotgun could dominate a match. I think that's where a lot of the saltiness regarding Halo 4 is coming from. It's easier for a regular Joe to keep up with a "pro player" due to the chaotic design of the multiplayer. But like Mario Kart, there is still a discernable difference between top level and scum players. As someone said, adaption.
In CE, I recall plenty of cave dwellers online in Blood Gulch creeping around waiting to get the 3-shot. There just aren't many wide expanses for Team Slayer in Halo 4 (outside of the ridiculous BTB), so Boltshot's effect is overstated.
EDIT: Some are arguing that a 3-shot pistol with heavy zoom is not overpowered. Alright, I tried. PEAAACCEEE /u4ix