I didn't think that FF7 was bad, but it didn't "wow" me either like it did for so many others. However, it's hard for even a good number of its fans to deny that presentation-wise, the game has not aged that well.
At any rate, my worst games:
-Paper Mario Sticker Star: Godawfully boring battle system; no new characters aside from Kersti, no unique locales; linear as hell; all the result of Mario's papa Miyamoto almost literally
driving the New Super Mario Brothers steamroller all over the development team. M&L4 better not suffer a similar fate...
-CD-i Zeldas: Horrid gameplay, awful voice-acting and graphics, and the fact that there are THREE of these fuckers that pollute the otherwise excellent Zelda series earn this series of abominations the title of "The Unholy Triforce".
-Sonic '06: The broken gameplay, ridiculous story, and outdated graphics result in a rushed betrayal masquerading as a "celebration" of Sonic's 15th anniversary.
I've played both Action 52s and Cheetahmen II, but I hesitate to count those since they weren't licensed by Nintendo nor Sega.