PS1: MGS
PS2: God of war 2
PS3: Uncharted 2
PS4: Uncharted 4 (till now)

Very clever way of mentioning. Kudos. Good list.

Great choices.

I am glad a few other people have chosen Valkyria Chronicles.

Tombi, are you doing this for other system makers? That would be fun :)

I was hoping someone more qualified would :)

The only non playstation home console I have owned is the Wii ;) so could only say Super Mario Galaxy!

PS1: Suikoden 2
PS2: Dynasty Warriors 3
PS3: Demon's Souls

PSP: The Legend of Heroes: Trails in the sky

PSV: Persona 4 golden.

I think we should be friends :P

Thanks, Valkyria Chronicles was awesome, certainly the best JRPG of its generation.

Three coincidences out of five xD . You, sir, have good taste! 

PS1: Metal Gear Solid
PS2: ICO
PS3: The Last of Us
PS4: The Last Guardian

As this is specifically about Playstation I'll give exclusives or timed exclusives greater precedence.

PS1: FFVII

This game had an undeniably huge impact on the generation, introduced jRPGs to Europe, popularized them in the West and is still influencing Square-Enix even today.

Honourable mentions: Metal Gear Solid

PS2: GTA: San Andreas

This was the perfection of the GTA formula for the gen. So much to do, three distinct cities, loads of fun vehicles and a great story to boot.

Honourable mentions: Final Fantasy X, God of War 2, Shadow of the Colossus

PS3: Uncharted 2

This exclusive pretty much the main reason to own the console. A great combo of platforming, shooting and a bit of stealth thrown in for good measure. A cast with a chemistry that is rare to find in gaming and you have a brilliant experience that defines the console.

Honourable mentions: Deus Ex: Human Revolution, God of War 3, Oblivion, Skyrim

PS4 (so far): Uncharted 4, although Witcher 3 is up there but plays better on PC.