Arcblade isnt unstopable but given the hunter using it if they're smart they know how to use it to evade just about anything many of them will just keep rapidly hitting right trigger/bumper to dart around to avoid fire most people really cant keep up with their speed so thats why a lot of them say its OP that and the ranged attack that you can chose for that super is a little broken imo but its a versatile super so I guess its meant to be that way. As for the whole start up animation BS unless you are brain dead you'll start you super when no one is around and then proceed to run into a room and murder people. I seriously cant see how people pull that card. Moving on though in terms of other supers Titans are lucky to get a multi kill with theirs because the enemy team would more than likely have to be clustered up in order for them to get the best benifit so I'd imagine thats why they'll use it to only take down one person, I mean literally I've gone entire games of Clash holding my super trying to find multi kill chances but sometimes they just never come. As for warlocks I cant speak for them I've noticed they can miss their super fairly easily not to mention they are probably the easiest to kill during theirs excluding Sunsinger. Oh yeah and I forgot to mention Titans only gain bonus damage resistance for FoH if we chose the perk for it but most of us take shoulder charge since its a 1hko or so I've noticed so not all Titans are nearly invulnerable during their super and we can be killed before it activiates if said opposition is fast enough or just uses a shotgun.