Literally just a copy+paste from my Facebook comment on this:
"As someone who has, and has personally explored all it has to offer, it really is just a legendary skin with in-game Chromas. That's not giving it enough credit, though.
The particle effects for each of the different variations are indeed different in ways that match the Exo-suit used. The Exo-suit animations and ultimate animations are also different.
That's where the differences stop, though. The taunts, attacks, and ability cast animations are all identical. There's no different voice-effect for the different suits's AI so the actual difference between the suits are aesthetic--the only way I can really describe it. Different suit designs and different particle designs but that's it. It's cheap, tbh."
It's like they took a Legendary skin, redesigned it a few times, threw it all together and call it an Ultimate skin. There's no real WOW here. Spirit Guard Udyr pushed the idea of a full character upgrade--that's all it really was: same character, updated look. Pulsefire Ezreal explored the idea of a character changing throughout the game, which is something that Elementalist Lux expands upon by giving her overall character and particles changes with each evolution. DJ Sona both expanded on the character and gave you a nice gimmick in changing the in-game BGM that's shared with your teammates. Gun Goddess Miss Fortune is just copied idea.
That said, here's a suggestion. The skin itself isn't bad, it's just cheaply executed. Each Exo-suit should carry it's own story in their gameplay; give you a reason beyond aesthetics to change the suit. There should be different taunts, different dialogue, different voice-overs, different animations for each suit. And it slips my mind so I may be wrong, but isn't the ring for her E ability the same for all skins? The suits need more variety than design and ammunition, and I think those suggestions would get people hyped for it and draw less criticism as an overpriced chroma-set. The skin is called Gun GODDESS for crying out loud. There's nothing very DIVINE about it, in any use of the term.
A personal gripe is in the fact that she has no unique interactions with any Pulsefire or Star Guardian skins. She has reactions for Ekko and Dark Star Thresh tho? [cass-cry]