The PS2 had all the major third party content exclusive in many cases that gen -- Grand Theft Auto 3/Vice City/San Andreas, Devil May Cry, Final Fantasy X/XII, Metal Gear Solid 2, etc.
When the Wii U has Grand Theft Auto V, Metal Gear Solid Ground Zeroes, Final Fantasy XV, and lets say the next Batman Arkham game exclusive ... then sure, we can call it the next PS2.
But right now .... no GTAV even planned for the Wii U, nothing on the MGS: Ground Zeroes front, no commitment on Star Wars 1313 or Watch Dogs, no Crysis 3, no BioShock 2, reports hinting at no Battlefield 4 either ... it's not even getting multiplatform releases of all the major third party titles.
The Dreamcast also technically was the "first" console release during that generation, not PS2. So launching first doesn't neccessarily gauruntee anything.
