From the words of Stephen Coles about Roboto – Typographica.org
When an alphabet has such unrelated glyphs it can taste completely different depending on the word. “Fudge” is casual and contemporary. “Marshmallow” is rigid and classical. This is not a typeface. It’s a tossed salad. Or a four-headed Frankenstein. You never know which personality you’ll get.
I should clarify for you that what I meant as poor was not related to what it looks like on any device. It was actually to the fact that it has been thrown together with multiple typefaces that do not compliment each other as a whole.