I know people who tried Ubuntu on the new Macbook Pros (2880x1800) and everything was so tiny they were literally unable to alter the resolution using the GUI.

I know people who tried Ubuntu on the new Macbook Pros (2880x1800) and everything was so tiny they were literally unable to alter the resolution using the GUI. They could not even click individual elements. They had to manually do it via the shell and even then they weren't able to see what they were doing... I wouldn't call that "pretty good." In fact I would call that shockingly bad. Linux still falls in the trap of re-sizing things to meet the resolution. As you increase the resolution things get small, and as you decrease the resolution things get bigger. This is a broken design. Zooming should have no relationship to resolution. Resolution should increase DPI, not zoom or scaling (or however you wish to word it). A font should be the same size on 1600x900 as it is on 1080p.