You should read
the Ganondorf thread for their thoughts on all these moves.
Warlock Blade does have super armor by the way, and stays active for an absurd amount of time, and has a huge disjoint. I don't really see any of the neutralBs as great, but Warlock Blade seems like the most usable of the bunch.
Power Vision adds an absurd amount of power to his counter. Greninja's "powerful" counter doesn't do much more damage, actually kills later iirc, and has horrid end lag that prevents combos off of it. I can't speak for Ike.
Distant Nosferatu does poor damage and its healing doesn't scale with your percentage like the default does. Distant Nosferatu and Goetia are also hellishly slow (both grab on frame 29; Nosferatu is frame 16), like, why-would-you-use-this slow.
I guess you could argue that the Arcthunder>Distant Nosferatu combo gives you an excuse to safely use up Nosferatu charges for the book to throw, but considering the potential for the default to swing a match back in your favor, it seems hard to justify giving up your trump card for a generally subpar tool.