I mean, from a technical standpoint the PS2 has higher raw performance numbers: 300MHz vs. 200MHz CPU, 150MHz vs. 100MHz GPU, 32MB vs 16MB RAM, etc. Even factoring architecture differences, those are some large number differences. Of course, what developers actually DO with the added power is another story. Just like some later DC games looked better than early PS2 games, some of the later PS2 games would have been impossible to bring to the DC. And they did manage to eventually find a workaround for the lack of AA on the PS2 with those ugly bloom and "smear" filters. ;)

The DVD player was a very good advantage of the PS2.