depends on what's interesting/entertaining to YOU. I like players that can send absolute bullets like Delpo/Soderling/Berdych/Tsonga and a few others. To me a perfect fh/bh down the line at around 150kmh is more "wow!" than a slice or dropshot
Dolgo and Mayer are two players I like because of their unusual styles, as evident by my signature. I feel like Petzschner also has an interesting style with all of that slicing from the backhand side. Mannarino is also unique because of the extremely short swing he uses and contrastingly Soderling is unique because of his long swing.
Steppa, Mayer, The Dog, Petzch, Melzer and now Young and Tomic are all well worth the ticket price pre match as they've all been able to develop their own unique brand of tennis and make it work at tour level... a few times a year mug flu sweeps thru the locker room and cuts down a few of these guys considerably lowering the ticket value post match...
i remember a long time ago there used to be this style where players would serve great serves and then madly dash to the net- and hit a shot no one hits (with any degree of skill) anymore- i think it was called a volley
wow- those days were crazy- like the wild west or something. no one plays like that anymore