If I played DA I'd definitely give them a try especially considering some very tragic Explodes! my leviathan has suffered. But as NL player I don't feel nearly as intimidated by Excindio.
It has great amount of attacks so melee-blender seems like a potent choice but its stats fall short of making it truly durable. If only it had T8 or 2+ or 4++ things might look different. It won't explode but it will fell prey to all sorts of weapons that Levy would just ignore. And Levy would not be cut down by a simple blob of Tacticals from the VIIIth in one turn or any self respecting veterans or elites even with just swords. Add in a not so insignificant chance to go berzerk or have its ehhh...head?...cortex? chopped off by a paragon blade straight away and it does not bode well.
It's sad but I would deem 3 Castellaxes a way greater danger than Excindio. That being said, I'm sure you can use Automata to great effect, as it's combat prowess is terryfing, aside from it being a fluffy choice too. And it has some interesting, if esoteric guns - i particularly like the lance-pulse shock one. I just don't like the high cost in relation to risk involved and suboptimal durability.