Played it first, like depressing storylines, liked the continuity nods to P2/P1, enjoyed the fact that it had the balls to make the unkillable god actually unkillable, preferred the cast of 3 somewhat.
Also, it was rereleased repeatedly and I've always been able to justify a repurchase on the new content. If 4 did that I would likely have followed suit there too.
And then I'd be so very, very poor.
I'm up to 3!
Contemplating a 4th, simply because I require a physical copy of P3P for shelf purposes.
It shall be a gift to myself later, methinks.