I'm not sure how to measure it, but I feel like I'm up against popular opinion. I think pixel fonts are unnecessarily hard to read, often existing at 2-3 pixels size on our modern resolutions. I'm not saying the current Arimo is good, but maybe a different font like a more fun sans serif font would work. I get that hard pixels fit with the aesthetic of most games, but it's possible to make high-res games in Luanti too.
Ideally I'd like to see games able to include fonts and replace them (probably with formspec prepend). That way the pause menu gets styled with a congruent aesthetic.