I thought you wrote it at first.
My opinion? Depending upon the genre, and the amount of win in the game, the game can be short I will still like it. Like Uncharted 2, which was short for my taste, because it was so brilliant, I had to go and play it again, and I am still playing it.
But Heavy Rain disappointed me in its length. Its a story based game, so I would have liked it to be a bit longer. I can't obviously enjoy pressing the X O all the time....even though there were different endings, it just wasn't that much of worth to spend 5 hours in.
Although for trophies and stuff I replayed it 2 1/2 times...
RPGs have a lot of dialogues and stuff so they have to be a bit longer, like 30 hours. I was pleased with both Demon's Souls(30 hours) and DA Origins(85 hours for me) length.
