Cross game chat is important to me. I have a lot of friends from real life that are on XBL (who live out of town) and it's just a lot easier to talk on party or cross game chat compared to using phones, especially when 3 or 4 of us get on. No doubt that it's not a huge deal or selling point, but it is a big deal to me at least.
Hopefully Infamous: Second Son comes out somewhat close to launch. As someone that's never played the Infamous games, it looks sick.