I would suggest not allowing a Striker Titan -a close quarters melee specialist that shines the brightest when he is within smacking distance of you- to get within smacking distance of you. How do you counter a Striker? By playing to his weaknesses just like any other enemy. Stay out of melee range and you will be fine. Can't keep that Titan out at a comfy distance? He keeps getting up in your face like any good melee combatant ought to? Then adjust your strategy. You're a Hunter right? Pick up the Mida, slap on some Radiant Dance Machines, crank your agility up to an 11, and stop playing his game his way.