yeah, I played Virtua Tennis on the Dreamcast and liked it a lot. Last one I played was on the PSP and that was still fun. The demo for Virtua Tennis 4 was just kinda bad. There are also four buttons now and I remember only 3 in the old games.
To be fair, the Virtua Tennis 4 demo is you as some rookie created-a-player doing early career stuff. Top Spin 4 demo is Federer vs Nadal. TS4 looks way nicer and just feels better to play. Last tennis game I got into was Hot Shots Tennis PSP last year and that's really arcade-y, so maybe that's why I appreciate TS4 more now.