We cannot judge positively a system/room if we are not there ...
But we can spot some negatives easily even through youtube...
We cannot judge but only negatively the level of beauty and charm of a woman with a photo or even with a video , we must see her, walking,speaking, seeing,eating,dreaming,seeing and smiling ,thinking in person to judge her positively ...
Only very problematic mind fall in love with image or video ...It is the same for sound experience...
Then Jay with a good room for his system will eliminate some negatives impressions or optimized the potential positives impressions. But we must be there to feel the system/room real value ...