I have mixed feelings on this. On one hand, if you included the manufacturer it would keep everything nice and alphabetically organized on the collection pages. On the other, it seems a little redundant to include the manufacturer at all. I'm taking a step out here, but I'm fairly certain every member of the sight knows that the Game Gear was released by Sega.
If I was going to cast a vote, it would be to eliminate the manufacture's info all together (except when it's actually part of the name, ex - NES, SNES, etc).
Either way, I agree that it should be uniform.