Hmm, whoever it was that mentioned they are players of similar skill level trying to win and therefore it can look a bit ugly is on to something I think.
I notice that, in the league in which I play, ther eis a bit of a spread of levels on my line. When I play against the best opponents (there is a young guy with a DI ride in the bag for next year, a former tour player and so on), I am anything but pretty to watch.. I scramble, lungle and hack my way to a result, usually a defeat in the 6 -2 - 6 -2 range..
However, when i play the weaker opponents (there are a couple of 4.5s playing up), or even the guys at my level (solid 5.0), I am way prettier to watch (so I'm told, anyway).
This is all about time and pressure.. The more of the former you have and the less of the latter, the better you are going to look. This is why a couple of 4.0s rallying co-operatively can look really terrific, and it is also why the two guys in the OP look a bit scratchy.
(it's also why Federer always looks so damn good, the game is usually on his racquet, even against Rafa it's the errors that seem to kill him..)
I guess this is all a bit obvious to many of you, but when I read some of these comments...