The Legion: Mediocrity Incarnate
I'm a Legion main, I've struggled up all the way to the red ranks multiple times rarely using addons and even with that I can very safely say he's below average at best.
I'll start with his ability, it's good in 3 and only 3 situations otherwise it is a complete detriment, first one being at the start when people are on the first gen and they're stupid enough to have not already started moving thanks to the mile long terror radius with an ability that demands they stay together. Second being endgame in a 2v1 situation and the gates aren't powered, you can use his ability to find people who are just flat out waiting for the other to die so they can grab hatch and dip. And third is what's called a Legion tech, when you have both Spirit fury and enduring together both 100% ready to go you can slap a dude, run him to a pallet and have him drop it on you which in 90% of cases is a free down, but people have brains so this rarely works anymore unless they're dumb, new, or desperate. Outside of all those mentioned it's totally worthless, never use it to move fast mid game otherwise you won't see scratches, don't use it to move fast early game either unless you want to be really dissatisfied seeing all those people together at one gen and you can't do anything about it except the usual.
His addons are complete shit with three being the exception, duration addons and the iridescent button, and the knives, all the others can go [BAD WORD] themselves and aren't even worth the blood points especially: Frank's, Stab wound study, and fuming, just take my word for it.
His perks are fine and have their purposes, no need to touch those honestly.
My biggest gripes with him are how once you get that free first hit you're a 115% killer and they can take you on the ride of your life and there isn't a single thing you can do about it. Not to mention the God awful cooldown that wasn't necessary seeing as how they already nerfed the cooldown addons into the ground, vault speed/run speed is also pathetic and makes duration addons a must have otherwise good [BAD WORD] luck getting more than one hit with it, if you are running both top duration addons you can literally run for miles no problem, a disgusting night and day difference and it's not even a very rare addon.
I gave him a shot, I "kept patient" to see what they'd do to him and we got another trash 115% killer with an underwhelming power in a game balanced around Hillbilly and nurse. I would rather play the boring, slow, easily loopable old Legion everyone even Legion mains hated, because my power meant more than a free hit once in a while, it was a way to down as scummy and unfun as it was, still miles better than getting taunted at the exit gate because my ability means nothing to a decent team.
It sucks that he sucks specifically being he was probably the best mori in the game by far, the best cosmetics, and a great menu theme.