I never brought my opinions up to Aegislash, but overall, I'm very impressed. There was always that ONE Ghost-Type in every Gen that I loved. Gengar is my absolute favorite, Misdreavus was really cool, Dusclops was my go-to Pokemon in Emerald, Giratina is a Legendary Ghost-Dragon (need I say more?), Jellicent is a Ghostly Boss, and now we have Aegislash! It has a great Physical Movepool, a usable Special Movepool, and oddly enough, it has Toxic, Reflect, and even...ResTalk? Odd. The Physical Movepool is VERY impressive, but a Special Set can be used for the surprise factor and to not be as hurt against Intimidate users and Will-O-Wisp, since Toxic is a laughing matter thanks to its Steel-Type. One move that seems useless to me is Autotomize since, in my eyes, you usually want Aegislash to have minimum speed so that it can always tank an attack, then retaliate. Next turn, the obvious King's Shield is obvious (unless you predict the opponent using a boosting move like Dragon Dance).
I absolutely love its Typing. The only two types to hit it Neutrally are Water and Electric--only four weaknesses and everything else won't nearly do a thing against it. To me, though, it will take considerable skill to properly use Aegislash--like Cloyster and SubDisable Gengar, timing and prediction are vital. Without the proper skill in either, Aegislash is likely to fall.
I'll train one up for competitive use and see how much more it does.