Re; The buy 2 used get 1 free gamestop thing starting at gamestop, here's a list I did about a year ago with some notable PS3 titles only available on disc and not PSN. I think only MGS4 has been added in the interim (though DMC4 was remastered) and there are some I missed like Star Wars: Force Unleashed 1 and Nier. The original post has some game trailers but there isn't an easy way to copy them over to a new post since the thread was closed.
https://www.cheapassgamer.com/topic/332424-psn-weekly-deals-1216-holiday-sale-wk-3-6-terraria-ps4vita-3-hotline-miami-749-child-of-light-8-last-tinker-9-pier-solar/page-57#entry11892480
3D Dot game Heroes (love letter to / parody of, top down zelda games)
Afrika
review
Asura's Wrath (or you could just youtube it...)
Bionic Commando (flawed but swing mechanic is fun)
Castlevania: Lord of Shadows (Vampire Slayer...of War)
NOTE: the Lord of Shadows collection that comes with the DLC is via a voucher code, so used it is basically the same as the vanilla version.
Condemned 2 (old enough might not be worth playing now)
Dark Souls 1 (Do it)
Devil May Cry 4
El Shaddai: Ascension of the Metatron
review
Elder's Scroll games (if you like that sorta thing)
Fallout games
FEAR ganes
Folklore
Ghostbusters: The Video Game (if you are a fan of the films it is enjoyable as they brought back all the original voice cast)
Heavenly Sword
review
Lost Planet 1+2 (constantly having to pick up heat is a mechanic I didn't think I would enjoy so I haven't played any of them)
Metal Gear Solid 4 (why is this not on PSN?)
Nier
Neverdead
No More Heroe's: Heroe's Paradise
Resistance games (nobody cares about the EU store, they have a 3 pack which is sometimes bundled with the dual shock 3)
Shadows of the Damned
Sonic Ultimate Genesis Collection
Spider-man games (Shattered Dimension is mostly enjoyable
review)
Splatterhouse (decent, bloody fun and has the original games as unlockables, featuring the homicidal voice of Tigger)
Star Wars: Force Unleashed
The Darkness
Valkyria Chronicles (great strategy RPG)