[Brainchild]

I think the absolute greatest victory of this line is that the combined forms look cohesive, but not coherent. It seems that those are the two words coming up most often, and people are taking them to mean the same thing. No, Gobuster Oh is not coherent, he looks like a complete mess of robot parts, but for that, he looks cohesive, or convolutedly combined together. Other mechs, like Gokai Oh, look coherent, with each distinct part showing, while they don't look cohesive at all, but rather, like a couple of bricks laid next to each other.
I think the biggest divide here is caused by the fact that different people want different things from combining robots. Gobuster Oh looks pretty odd as a display piece, again, being an amalgamation of random bits and pieces, but he looks like a really cool toy robot for that same reason. I like my robots to look like they've actually combined, as opposed to something traditional. That's my problem with Gokai Oh, Gosei Great, and whatever else. In vehicle mode, the individual components look like arms and legs with wheels, while in combined mode, the components look like animals or vehicles with hands and feet. The individual components of the Gobusters have taken an enormous step forward, by introducing tons of functionality for the individual components, and combined modes that look, well, combined, and I really love the line for that. It's a shame that not everyone could be satisfied by it.
And I still don't get how people can say Rai Oh looks better than Gorisaki in any mode. That's just ridiculous.