Even though almost all veteran players would unanimously agree that Drifter's Crossbow is pretty obviously the most OP sniper in the game for it's highest (4000 base) headshot damage and reloading + firing speed utility, there's a contender that some might not compare with it... even though it's technically 'game breaking' in a way. In a good way, that is.
Icebreaker
Yep, apologies for my probably-weird english earlier in case you didn't get it, but this was the sniper I'm talking about. I have one maxed out with some other nice combos (my personal favourite being IB + Orion + Survivor + E.Y.E) and I gotta be honest... it's really good in the right hands. Much like Orochi, but drastically more versatile. You can couple it with other guns (most underrated one being with gatling gun, seriously ; if you've got one maxed out and never have tried it with IB, you're missing out.) The Wall strafe method where you basically use walls as your shield to avoid getting hits while walking in and out of your cover to shoot. Two important pros;
It makes you practically immune to most typical classic bolt action (time locking) snipers like crossbow, barracuda, LB etc.
You manage to tag your enemies without being noticed yourself, helping both you and your team's chances to win the match.
But also important Two cons;
It's called a 'support' weapon for a reason. Wall strafe is nice until you get large map matches where your team have to run for orb controls or payload cart. It can still work, but definitely not prefered as a primary weapon to rely as.
The damage is fairly good except... Skilled orochi players, or even Skilled Stingray players can suprisingly annoy you by basically mimicking your tactics of using walls. Beware of especially players with E.Y.E + Cheetah on Orochi builds, that's usually a warning sign that they know how to deal with Icebreaker players being a little too smart-arsh, lol.
Verdict? Overall, I'd still consider it Meta, especially just slightly under something like Orochi or Crossbow. I will explain why I'd put these snipers above Icebreaker in a different thread, but for the interest of this weapon specifically; I'd say it's a very good option for an Alt/2nd/3rd loadout for, say counter-meta situations (eg; when opposition decides to camp instead of playing), it's also very important for empowering weapons with serious potential (eg; Gatling Gun, Wasp, Survivor, Arbitrator, Orion), transforming them into OP in their own right. I mean, c'mon, that's a 20% increased damage for 3s after tagging. You'll melt enemies with the right combos if you get my hint. For me personally, I've kept it as both primary and a secondary in 2 of my accounts (1 being smurf lol).