What makes a video? Chun! What breaks it? Ken!
But seriously, I like a video where both players seem evenly matched. What you said about one character doing well etc, I know what you mean, a lot of matches tend to go one way, with one person dominating (NOT always, Im not saying that, but Ive definatly seen many matches like this). Sometimes this is due to the other player simply being stronger. Sometimes its due to a bad matchup (Urien vs Makoto, for example. It could be that the loosing player is just not playing well that match (it happens). Someone ALWAYS looses in a match of SF.
As for what I like to see in match vids. Both players struggling to keep control of the match, meaning one person just tearing it up, then vice versa. I like seeing crazy comebacks (like someone getting their entire bar taken away and come back to take the opponants half bar without getting hit).
I DONT like watching Chun vs Chun matches (I have to see them enough when Im playing them), or matches with Ken in them, just because I have seen so damn many Ken matches. Other than that I like watching pretty much any matchup.