"Yes!" the punter would think. "Yes, that machine has a tick on it, so it must be good."
Perhaps Microsoft were going for reverse psychology with the Xbox.
Why was it green? Xbox co-creator Seamus Blackley revealed the story to IGN: “A guy called Horace Luke, when we had to have a logo for a meeting or something, he had one of those awesome sets of markers with the paint tips, and so everybody immediately stole all of them. The only color he had left was like the green nobody wanted, and so we made all this artist stuff with green and now it’s like still green."
So are game logos less good than they used to be? They're certainly less interesting, more corporate. At the same time... there's a certain excitement when it comes to anticipating Nintendo's NX logo. How will they tell the story of the machine with its logo? Actually, that's not exciting at all. But... y'know... well. Whatever.