Sega are out of their goddamned mindsI really don't think that this is any less cramped than the Game Boy Micro.
This is a really quick job, but I took the GB Micro dimensions from Wikipedia, grabbed an image of the machine from Google, and scaled it so that 1mm was equal to 4 pixels. I did the same with the Game Gear Micro using dimensions from Amazon and an image of the machine from the Amazon listing.
This image won't be actual size, but it is to scale (with a margin of error because I only spent two minutes on this, but that margin of error won't be significant). This is how they match up:
The micro was perfect in size in my opinion, even better for 2 button games like game gear's.