What does "terrible performance" mean? Why is there some convoluted benchmark instead of a description -- better yet, a video -- of how it actually works? What

What does "terrible performance" mean? Why is there some convoluted benchmark instead of a description -- better yet, a video -- of how it actually works? What is it like to use one every day? Is it useful at all? I don't get hangout requests every 15 minutes, does the battery last a day of normal usage? I remembered why I don't ready tech press any more.