In my opinion, they rated inFamous too high, and this too low. That said, it's all in the play experience.... I have found some of Heavy Rain's graphics really off-putting, since you'll see amazingly detailed stuff and completely bland polygons on screen at once (Ethan tucking in Sean.... what was that, an 8-bit blanket? Or had the boy cut strange angles into the top?). Other games with minor graphical pop-up or anti-aliasing here or there you might overlook, but when you can see the pores on someone's face, then the edge of their door looks like a serated knife while it's moving, it is jarring. The game also froze during load screens twice for me... The voice acting is similar, where some performances are top notch, and some (the children especially) are horrible to the point of distraction, all the worse for being in the same scene with the better actors... despite this, I sunk hours into it today, found it incredibly engaging and enjoyable. I'd give it an eight out of ten.
inFamous, on the other hand, I have never been able to play for more than 15 minutes without it glitching or crashing, I found it repetitive and derivative (generic hero with a couple powers from Force Unleashed dropped into one of the Spider-Man movie games), and when the "big reveal" was spoiled for me, I have to admit I thought it was one of the stupidest stories I've ever heard for a game. My wife, however, never once had an issue with the game that didn't immediately rectify itself (she was dragged cross town by a car she inexplicably tried to cover behind... or rather, Cole did.... and she had some enemies get caught in the environment. Compare this to me falling through a building or getting stuck in teh sidewalk, or suddenly having all the police shoot at me because I saved one of them....) Our scores for the game would differ drastically.
If they looked at Heavy Rain as just an interactive animated movie, then the lack of polish in the acting, the "uncanny divide" that makes some scenes so off-putting, and the stiff animation (the way Ethan walks or page "cleans her face" look especially broken when performed by something so freakishly lifelike) would really hurt the score just like they would if this had been a theatrical release. 4 out of 10 seems REALLY harsh, but it's not indefensible any more so than their other scores.