One of the things that I think absolutely holds up about these games is the soundtrack. Budokai, Budokai 2 and Budokai 3 all had awesome soundtracks, a great mix of guitars and horns. Unfortunately the composer for those games, Kenji Yamamoto (no relation to the Super Metroid composer) recently got in trouble for his work on Dragon Ball Kai, in which he plagiarized a lot of songs from movie soundtracks, and older songs of his have also been discovered to have plagiarism in them as well. As such, Namco Bandai has responded by replacing the music in Budokai 1 and 3 with music found in the Tenkaichi and Raging Blast games.
If the soundtrack is a large part of your nostalgia for this game, you're better off tracking down old PS2 copies again.