really? so you expect every one to decimate everyone on the enemy team with a sword? ha you can't be serious it does take skill to do that, stealth and of course luck. and well I agree to some extent that the sword can be pain as I said only with people who know what they're doing which is rare. and as I said again nerf the speed but keep the lunge the same this wont make it somewhat underpowered. now i don't know if these changes will make the sword underpowered or it's going to make it be in an ok state.
In an arena setting, there will always be at least one person who utilizes the sword to either run away from a losing battle or charge the enemy like a maniac with little consequence. Stealth is almost never a factor when the weapon is more useful for aggression with its speed, so take that out of the picture in terms of skill. As for luck, I'd say it's more so the mechanics put in place that forgive a player for decisions that would otherwise be punishable in older halo games, such as Spartan abilities. The Spartan charge is a crazy example of this in terms of just sprinting at an enemy and getting the kill because the charge prevented him from meleeing you in the process (due to its knockback).
Why shouldn't the lunge be nerfed? The smart-scoped lunge, in particular, is absolutely BS and unnecessary for the game, while serving as an example of 343 trying to make previously niche weapons more versatile in the worst fashion possible. There is already the lunge from simply sprinting and pulling the trigger or spartan-charging (which is also a 1 hit kill), so why does the lunge from aiming have to increase the range even further? I'm sorry that weapons like the sword should only excel in the range that they were designed for (CQC) and never reward players from mindless aggression like Halo 3, but that's impossible with the spartan abilities put in place.
Besides, there is a way to maintain the lunge of the sword without resorting to the lock-on that it always has. All 343 would need to do is create a static lunge that functions independently from the RRR by pressing the trigger, while the melee button gives the regular melee. This static lunge would deplete energy from each use, regardless of whether you hit the enemy or not, and it doesn't lock on to players, forcing you to aim properly and sometimes lead your reticule to actually hit the enemy. Now the sword can actually require more skill as a tier 2 weapon by increasing the aiming skill gap for players, whether it is utilizing the melee button for quicker swipes in CQC or the static lunge to close the distance while maintaining your sword energy levels.