Of the players I have seen live Roger was easily the most impressive.
He had it all - power, variety, quickness, agility. Something very special.
I wasn't too impressed watching Nadal moonballing his way on grass to getting destroyed in straight-sets by Dustin Brown. He looked so helpless.
Although it was great fun, one of the most enjoyable matches I have seen!
Raonic was excruciatingly boring to watch live. He just looks weird as well. But that's the same on TV, so w/e.
The player with the biggest difference to me live vs. TV besides Roger is Richard Gasquet: very impressive variety, angles, interesting shape to the ball, so well-placed, often soft and yet effective.
Haven't seen Djok, Murray, Dimitrov, Wawrinka of the more famous top players.