Leading the way was Soul Calibur, one of a handful of games to earn a perfect score from Famitsu[1] and it actually blew away the arcade version (!)
NFL2K was also a launch title and while I'm sure a lot of the HN crowd is allergic to sports titles, it was far superior to contemporary versions of Madden... got correspondingly high reviews as well
Sonic Adventure was pretty spectacular too I thought, I would call that an 8.5 or 9/10 (like a lot of 3D platformers it maybe hasn't "aged well" but at the time, I thought it was spectacular and it was well reviewed)
Power Stone was a blast too.... Hydro Thunder.... bunch of other solid ones. Day one.
https://www.mobygames.com/group/13786/launch-title-dreamcast...
Here was the PS1 launch lineup. Ridge Racer is the only really good title here, excluding previous-gen ports like NBA Jam and Rayman. Toshinden was obviously mindblowing as the first polygon fighter many played but it's sort of a notoriously bad game.
https://www.kotaku.com.au/2020/06/playstation-launch-titles/
But in some ways that just shows Dreamcast had already lost the war before it launched. Sega did everything right and hit the ground running with what many consider the greatest launch title lineup in history, but their rep was too tarnished.