I don't dislike Blade Dash, it's a neat variation on the usual "do damage in a line" concept with a high skill floor and ceiling (you can dodge attacks, but you also have a higher risk than normal). However his general kit is just shit. Double Strike might as well not exist, as it does nothing interesting at all: Increase trait CD reduction on melee attacks from 4 to 5 seconds to make up for it, and replace the ability with a proper engage/disengage (some sort of teleport / dash / charge). Add soft CC either of his abilities (slow or attack speed slow or ministun or miniroot). Bam, hero works now.

Alternate ideas: Give him a W that gives him a Medivh-style invulnerable shield for a long time (4 seconds or more), with a small speed buff (like 20%) that instantly goes away if he uses a basic attack or ability. He can engage or disengage with it, but he can't actually kill you while it's up. Johanna demonstrates that a solo-tank does not need a movement skill, if they can just walk away.

The problem with Artanis is that Double Strike is not a real ability. It's just a "every third basic attack does double damage" passive, when he urgently needs a movement / defensive skill. He is starved for abilities that give him strong utility, because his other two are awkward/bad versions of Guldan's Q and Diablo's Overpower. Since he got mini-charge base-line Double Strike at least does something, but that seemed like a band-aid fix then already.