I don't think the WoW and other MMO crowd is the target audience for this. I am pretty sure they mean for the PC version to be an additional way to play PL. As I stated before I look forward to it so I don't have to constantly drain down my iPhone battery.
You are 100% correct that PL can't stand against WoW, but I don't think they are trying to. That being said I am sure alot of WoW and ex-WoW players play PL as it gives them a sort of condensed version of what MMOs are. Basically you have towns and instances...that's about it.