Top Spin 4 seems really good for a sim like tennis game (i've played some multiplayer), but I just don't find it anywhere near as fun as Virtua. Playing with friends, I found the game so sluggish and unresponsive compared to VT. Not to mention you don't have dive shots and the like to keep the rally going either.
None of my friends played with had even playev VT before though, so I might try to get them into it when VT4 is out. I'll make certain to show them mini-games too.
One clear indication that VT is made more for 'fun' and arcade than TS is that there is no music whatsoever TS4 during the matches. As a VT fan it just feels too quiet.