Why does the Playstation 3 continue to receive poor ports?

[Mummelmann]

Reasonable; I also think attach rate and overall software sales are a big part of it. Look at GTA 4 for instance, it sold 1.5 million more on the 360 despite having been viewed as a Playstation franchise for over a decade. It makes sense in a lot of cases to use the 360 or 360/PC as lead platform.

All in all though, does the PS3 really receive a lot of poor ports nowadays? I don't have that impression, all though some of them arrive a tad late... (Lost Planet and Bioshock for instance).