Yeah the online psn service is so broken that Uncharted 2 multiplayer is no good (sarcasm)
If other developers can get their games to work well (online) and trust me naughty dog set a really good example of how to create a really great online experience, it's just valve is lazy, plus i think m$ may have put $$ in their pockets just to say that.
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1