[Quote- watching Isner serve at that top level is not as interesting as Federer-That is what I said but I'll be more direct. It is boring to watch Isner,He has no other weapons at that level and he either serves well or goes home. I have an opponent who was a college baseball pitcher and has a big serve but seldom wins because he has no other weapons and a "smart" pusher who gets it moves him around and wins all the time.
Yeah I find Isner tennis boring too. On appearance he doesn't look like he's trying. Slow-ish and often letting the ball go by. I love Djokovic and Nadal when he was on. They are like circus jugglers. Never drop the ball!
Federer tennis is more boring than Djokovic and Nadal. His style is to finish points as fast as he can though he does make good shots. He's not a runner, juggler type. It feels too quick and random. Emotionally Federer doesn't look like he's trying. It's not grit!