I'm not an expert of typography, but to my eyes, it's a nice, clean, readable screen font. So is the Droid font family. It's not my absolute favourite, but there are more pressing issues in the world.
What annoys me is not so much Gruber or other bloggers having an opinion, it's the followers who take what they write as fact. Roboto probably isn't a font for the ages, but it seems to do what it set out to do very well. The people who worked on it aren't idiots.
Android has its issues, but I'm sick of the little cabal of Apple writers who portray it and everything surrounding it as a trainwreck.
It's very very clear that he doesn't care to give anything Android related a single positive thought. I don't care why, it's not something I choose to engage with, but you can't honestly suggest that (1) the linked article actually said anything other than, "I know you are, but what am I," or that (2) ANYTHING Gruber says about Android can ever be taken at face value after his very long and well documented tendency to go beyond the truth to disparage it.
I think that an argument can easily be made that the font doesn't look classically right on a large screen. On the devices I have seen it on (especially because the weight is usually so low that the terminators are essentially invisible) it looks just fine.
But guys, seriously, don't use this on a webpage.
The remainder of the post is a diatribe that only succeeds in saying "nobody else likes it either."
"Roboto is ungainly, homely, unharmonious and it looks exactly like Helvetica, which of course is gainly, beautiful and harmonious."
Why do so many people need to have such STRONG OPINIONS about everything that isn't what they happen to own?
Has anyone done any A/B testing? How about controlled surveys? I'd like to see actual data collected from normal people who don't know Helvetica by name.