Probably the fact that it looks like your vacuum navy sailors took a shuttle down to earth, absconded with a CIWS turret from a wet navy vessel, carried it back up to the orbital shipyard and bolted it on.
Your turret there is tall, with a small diameter. By contrast your other turrets are squatter with large diameters. They also look like they're made of the same hull material as the rest of the ship. If redesigned your Artoos to look fall more in line with the other turrets (after all, there is no reason for you to retain a wet navy design, just because you're using a wet navy concept), the overall look of the model would be more unified.
Its somewhat akin to all the whinging and moaning about Ryx's turrets for his Orion: no one said they weren't good turrets. Everyone said they didn't fit with the Orion. As with the Orion, so with the Cyclone.
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Oh, and your recon drone gave me a great idea.

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