In regards to Blu-ray, the developer criticized the lower read speeds of the medium. "Great for watching movies, but not so great for games. Getting data off the Blu-ray drive takes about twice as long as it does to get the same data off the 360's DVD drive. That translates into longer load times."
The challenges that developers face when coding for the PS3 have inevitably led to "sloppier" ports, where the PS3 versions of games on Xbox 360 run more sluggishly. Jason Booth postulates that "Getting equivalent performance out of the PS3 requires a lot of work unique to the platform, and in many cases, even with all these tricks, you still won't see equivalent performance. Thus, many PS3 games have simplified shaders and run at lower native resolutions than the 360 versions. On top of this, there is shrinking incentive to do this work; the PS3 isn't selling."
[Update: Added "former" to description of employee.]