I played the demo and thought it was pretty bad. Evidently, this reviewer feels the same as me. Do either of our opinions make Heavy Rain a bad game? No. Is this 4/10 from a non-mainstream review site going to make the average consumer avoid this game? I doubt it.
It's sad how true personal opinions are secondary for reviewers these days, especially for big games. All of the reviewers from the big websites are mortified to give hyped games low scores due to serious backlash (or job loss - Gamespot), and when a smaller website does it, they're mercilessly attacked. The fact that developers and gamers alike are so transfixed on the idea of "AAA" is really harming the industry. I mean, why do people actually believe that a game with 90 metacritic is wholly superior to a game with an 89? It's ridiculous.