I don't really care if you disagree with me because you like the colors. I explained it already. Gallia is stuffed and it is obvious the designers of Gallia wanted it to have one of everything. The systems are all way too big, contain way too many planets, they are horribly intransparent. I can explain it to you in detail.
This is Ile-de-France, which already makes me ill of france. The hexagonal trade lane network is unique and cool, but that's all positive you can say about it, because it is too much. Like most of Gallia, it offers too much, it almost floods you with content. The stations are nicely designed. The nebulae aren't. You have both a green fart cloud and a purple fart cloud that totally don't fit with the theme of the system. The starsphere is okay-ish, although the Sirian Nebulae are too close to Gallia. The most disturbing thing is the purple nebula as it has poofs that don't match the nebula color well and then again, looking at the thing from the side, you see how 2D the poofs are. That's not well done.
Now look at the other gallic systems.
Gallia has one of everything if you look at the colors. The only really interesting system, to me, is Burgundy for obvious reasons, because we don't have any other system that has a planet in the center, mostly only suns.
If you look at the other houses, however, you see variations of their respective theme. The devs really looked at the systems' placement on the sirian map. Even the modded systems. New London is red, Leeds is orange, Poole is purple, Manchester is the passage from Barrier blue/gray to Bretonia red. Omega-3 is a passage between Cambridge Barrier bluegray and Walker Nebula orange. Rheinland is completely orange with variations, Kusari is just blue and blurry, the Sigmas are a mix of blue and green blur, the Omicrons are pretty exotic, just like the Omegas. Like, the latter two regions show the wilderness of cosmos. The Taus are just rocks behind the barrier and partially inside it. Even the independent worlds look at their respective positions, although the Cortez starphere indicates a big star cluster between the Barrier and Liberty.
Gallia also has a big problem with planets, as almost none of those planets are really important. It's intransparent. You get the idea about each important planet in each house, colonised and barren ones. In Gallia, it's just spat out planets everywhere because they wanted to have "realistic" solar systems. Doesn't work too well. It works well in very few cases. Penny is a good example. Starsphere fits, planet placement fits, the most important planets have a focus with trade lanes and stations and the planets aren't just a senseless mix of colors and types. It's not "too much".