Meaning a game that was good or you found was good but didnt get the attention it deserved because it was covered by all the AAA games like COD and AC. and no TLOU and COD arent buried treasures there still in the spot light.
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These aren't necessarily PS exclusives (not sure if that's what you were looking for) but here's some I enjoyed that I don't think got crazy attention:
Sniper Elite V2
Splinter Cell Conviction
Splinter Cell Blacklist
Not sure those last 2 are "underrated" but anyway....