The lights are on
I have to say mine was Ratchet and Clank. I loved the weapons and the characters in the games. I want to know about exclusive titles or it could be cross platform.
Growing up, my favorite series was Spyro the Dragon. Hell, I still love it that I've owned the digital copies from PSN ever since they were downloadable.
kingsfield/shadow tower series
I would have to say either the uncharted series..or the Persona series...both had my attention for weeks. and persona well...months.
I agree with Little Big planet, and Devil May Cry is one of my favourite series.
The Uncharted series as well as the Killzone series and the GoW series are my all my fav playstation exclusives.