Because quality trumps quantity.
List has nice variation but nothing earth shattering. Especially since many are on the ps4.
Quality trumps quality, yes...and this list has both. It has a sizeable, respectable number of games, some of them are great, most of them are good. Spider-Man and Astro's playroom are 85 and 82 respectively, Demon's Souls is likely to get great reviews, and While it might be a stretch to assume Sackboy will do well, it'll likely do mid to high 70's, which is good for what it is.
You can't say this is a bad launch unless you're weirdly super specific about what you like or are just trying to downplay it. If you don't like it, that's fine. I hate Call of Duty. I'm not going to pretend it's not a good game or a great addition to the launch lineup. same with Assassin's Creed and Watch-Dogs, they're not for me, but they're still good games.
My Console Library:
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android
Top 6 this generation:
Bloodborne, Sekiro: Shadows Die Twice, God of War, The Legend of Zelda: Breath of the Wild, Dark Souls III, Red Dead Redemption II, Rock Band 4