So my quick and dirty review after putting a few hours into the system and a couple games.
The new UI is so much better than PS3. Being able to multi-task makes it a much nicer experience. Apps open and close quickly. I find that the main bar layout will be a total clusterfuck, though, once you have a lot. I have disk games and I've downloaded Flower as a purchase as well as every free to play game and it's already getting a bit cramped. Hopefully they will make some way to sort or create folders on that bar or in the Library app. All in all, though, the UI is very nice. PS store is about 1,000 times better than it was on PS3.
Killzone looks phenomenal, but the gameplay is pretty generic for the hour or so I put into it. Also, I wish every dev would license or copy Naughty Dog's facial expression/lip-syncing. They have set the bar very high with Uncharted and Last of Us and now it's pretty noticeable when it's not as good(and Killzone is definitely not as good in that regard). This is a good 'show off' for the upgrade from PS3, but I don't really see myself putting much time into it beyond quickly beating the single player campaign.
Resogun. Get this game. It's awesome. I really suck at it, though.
I haven't played any of the other stuff yet, but my initial impression of everything is pretty positive. I'm not really big on the bright-ass LED light on the controller. It's distracting and annoying when I was playing Killzone in my living room with the lights all off. There should be an option to shut it off if your'e not using the camera motion sensor.
