Stumpokapow
listen to the mad man
Cruzader said:a)Show PSN uniqueness
b)episodic gaming
This doesn't really answer the question, because the former is a product positioning thing--Y2Kev is asking Sony to consider positioning their products differently, so this explanation does not exclude his suggestion.
The second argument is a little better, because it describes something about Siren that actually makes it uniquely well suited to PSN.