Minecraft Preview. Has anyone tried Multiplayer?

I played a little co-op last night and although it was fun, I was hoping for co-op campaign, not co-op short stories like MW2 had. Very disappointing. To me, there's a ton of difference in the two.

I thought the Mp was ok but nothing to sing home about I don't play the multiplayer anymore since I got the few achievements related to MP. The co-op legends are pretty cool tho if you got a friend you like to play with but you don't need a friend from your
list anyone can jump in and play them with you.

There's Road Rage and Legends of the Wasteland. Road Rage is mostly Triad/Chain Rally and Meteor Rally racing, competing against 3 other people to get 200 points. Legends is a co-op mode made up of 9 missions that tell little stories about people in the
Wasteland, like how Dan got the sniper rifle that saves you at the beginning of the game. It's laggy from time to time but no frame rate issues and for the most part it feels really fair.

is that through the Xbox One controller or Xbox 360? Or, is that because of some interference with the connection?

You can do it but you'll get lag. Like if you hit the button to jump, you'll see it jump on the screen a little later than you would ordinarily. Wouldn't make for fun gaming.