The Bold Roboto [1] just looks awful on my machine. Arial [2] looked much better, and if they want to use the system font, Ubuntu [3] also looks much better.

[1] http://i.imgur.com/zfThWXP.png

[2] http://i.imgur.com/qngKbGq.png

[3] http://i.imgur.com/77vDhCd.png