If you want all those things lumped up into one website, even though I don't respect the site anymore, the IGN PS3 channel is your best bet.
The better choice in my opinion would be a mix of Metacritic scores and 1UP.com for reviews, 1UP.com for previews, and PS3 Fanboy, Kotaku and Joystiq (throw a little Siliconera if you like Japanese-developed games) for news.