I really feel that "unfinished product" is not really a problem here. The console will get updates and new services for years, it's not like they could deliver every single feature day 1. OK, they talked about resume very early, that's one of the few points where you can talk about "unfinished", but still, overall it plays games, they delivered the core features, and you can expect a few undelivered features.
No, the problem is, as you said, that they are just so damn slow to deliver updates ! And in lot of cases it just not takes forever, the result is just awfull. The invitation in games on the PS3 was pathetic, sending a message, finding it. I feel they are still thinking like an electronic manufacturer, you deliver the product, reduce cost where ever you can, and feature development is one of these cost. I hope it will get better with the PS4, because they now have the power, memory, dev capabilities of a PC, while the PS3 was specific and constrained development. But still, I can't understand for trophies.
