It's not even about tits or ass. Just think about the design itself. I knowa bit about design, so I'll elaborate below.
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1 - They chose the blandest pallette color for the character.
2 - There's nothing interesting about it. It can be sumed up as "spacer with rocket launcher".
3 - It has nothing designating their class, other than the weapon. TF2 figured this out decades ago. The explosive guy has explosives on his belt, plus injuries from the natural colateral damage from explosives with the eyepatch. The devil is always on the details.
4 - Samus's space suit is iconic due to it's color pallette, design, gadgets and abilities. This one has nothing, you can't even point out where there's a life support system or the place to store more rockets.
5 - Tits or ass don't really matter. Sure, you can have it. But you shouldn't rely on it as a crutch for character appeal or desgin. I have seen people thirst for old hags in suits because they have appealing designs.
Most of the other characters have the same primary problem. They rely far too much on their weapons. If you photoshopped the weapons from them you wouldn't be able to tell what they are supposed to be. You do that with TF2 characters and you can still guess their roles correctly.
