My big problem with Roboto is that the choice of closed counterforms for many letters and numbers (35CGSacs) is an inherently anti-legibility choice. Yes, they had more of these before the revision, and some (5) have been slightly improved, but they need to finish the process of transforming it into a different typeface if they want it to be an outstanding UI typeface.

Indeed, I would argue that such closed shapes are stupid bordering on criminal in a user interface typeface. There is a reason that most other typefaces specifically designed for user interfaces have used open counters, and that is because there is massive evidence that tells us these shapes are more legible (see for example the research cited in Sofie Beier’s book on the subject). Legibility should be a the paramount concern for a user interface typeface.

Thomas Phinney.