This just doesn't make any sense. Starting out on maps like Estate, where you can rush right away to where the other team is coming out, you can scope and immediately pick off a couple of enemies. Would you rather do this with a gun that is bolt action and only holds 5 rounds, or a gun that has consistent recoil, twice as many rounds, and allows you to take down multiple enemies in a row? If you get rushed, would you rather be holding the rifle that takes twice as long to switch off of or the Barrett? There's literally no reason to ever use this gun, I think it is without a doubt the worst gun in the game since there is NEVER a reason to ever use it.
65 RPM versus 600 RPM with same multipliers, better recoil on the Barrett, better sights (opinion though), double the clip size and ammo reserves, lower raise and drop time on the Barrett... The Intervention is the worst gun in the game.
It wouldn't matter which I do it with, since regardless of which one I use, I'll be shooting at about the same rate. The bolt action of the Intervention FORCES you to allow your recoil to end before taking another shot, the Barrett doesn't. However, due to the recoil, you can't just take two shots immediately, or your second will go way off target. You have to wait and retarget before firing again. Furthermore, the distance of the targets at the beginning rush of Estate makes taking very rapid shots impractical, as the targets are small. Then take into account that you're just as much under fire as they are, and you need to move quickly and not miss. The ROF for the Barrett is not very useful in this situation.
If I'm being rushed, sure, I'll take the Barrett. However, in most cases, I'll have a Claymore set up to hide behind, a wall or some form of cover giving me enough time to pull out my sidearm, flashes, and if I really need, Commando. (inb4Icy)
I just tested the ADS time and the switch time for both of them (switching to a USP Silenced). The ADS time for the Intervention is slightly slower than the Barrett, it felt to me, but not enough to actually matter imo. They felt the exact same when switching to my handgun. There's not much difference here. Mag size rarely matters for a Sniper unless you get rushed and need to blast it off hipfiring or something. Ammo reserves do matter, but 20 potential OHKs for the Intervention is fine (No Scav Pro). Assuming you only hit with half of them, that's 10 kills, then add in your Equipment kills, potential secondary kills, knife kills, Killstreaks, etc. The ammo given to you in the Intervention is sufficient.
The Barrett may have a potential ROF of 600RPM, but how fast are you actually firing the thing? Maybe a bit faster than the Intervention if you're legitimately sniping.
I'm well aware that the Barrett is better in every way than the Intervention. I'm just saying that the differences rarely matter.
Edit for Mad's post: I'm having the same success with the Barrett, although when I first began using it, I felt like I was missing shots due to the sights or something. I got over it quickly.
Also, Steady Aim is bad for Snipers, imo. Never need to hold your breath for 9 seconds.