There are some great restaurants in Terminal 4. Good luck finding, them, though - there aren't any maps posted anywhere. Yelp helped, but a directory and map of them would have been nice. Terminal 4 is a sprawling terminal.
The wi-fi is free, but spotty and required constant re-authentication. Power outlets are sparse at the gates.
On the upside, the carpeting is going away and some gorgeous terrazzo is going in, and there's interesting art installed throughout.