I think the free games are fun. War Thunder I really enjoy.
I haven't played War Frame in only mode. Single player mode does seem very Arcady, but I think you can get used too it. Haven't spend a lot of time on it though.
Resogun is Arcade, but it is addictive.
I can't recall the other free game, but I haven't played it either.
Free to play MMO's like DC Universe can also be downloaded and your PS3 profile will be imported to the PS4, leaving you on the same level as on your PS3 profile.
The PS4 is not a must have at this stage, but rather a "nice to have"
There are some known issues that plague some owners, but they can mostly be sorted without returning the system. These problems will probably addressed and later released version.
Some features, especially on the media side iare lacking atm, but most will be addressed in upcoming firmware updates.
I still love my PS4, but I like the PS4 and it will only get better. The PS4 is very fast and smooth.
If it wasn't for GT6, I would have moved to PS4 for all gaming and media functions
Edit:
Stuck me now that I sound like a PS fan boi, which I'm not, but I did miss the actual topic.
You can check this link.
Couple of guys have sealed PS4 units, or used PS4 consoles for sale.
http://www.sagamer.co.za/forum/forumdisplay.php?461-Marketplace-Playstation-4
Edit 2:
Removed Dust514 as a MMO that can be played on the PS4. I was talking rubbish.