It's true, Heavy Rain's characters were it's weakest point. Take Jason for example, am I seriously suppose to be sad about his death? The kid was so frickin' annoying and stupid, it doesn't help that the scene was riddled with ridiculousness either with lines like "uhh, the red one! The red one!" or "JAY-SON!!! Jay-son? JAY-SON!?!" Only character I liked was Shelby, despite how silly his plan was.
Meanwhile TTG's Walking Dead's highest point is the characters. Clementine, for example, was actually not that cliche, super annoying, and stupid kid that I've seen in so many films, TV shows, and games.