L.A Noire is very, VERY time consuming. But was easy to play after a month of playing so many hours a day.
The Walking Dead by telltale games (once the finale DLC comes out) will be a 2 out of 10 to plat. It's easy. Sometimes you just have to keep clicking on things or go back and fourth talking to characters.
Wasn't there a game called .detuned on PSN or something? I don't think it had a platnum, but the trophy list was almost incredibly easy.
Yes. It's a couple bucks or something, and is still on PSN. It has 1 gold, a few silver and bronze.
Also - Spare Parts is also another easy game to plat. It took me 2 full days of playing it.