I've played with friends online and I've played the play now option quite a few times. I've experianced major lag about twice only. That's not good, but it by no means is awful either considering the times I've played. I believe it really depends on your hosts connection. I've not once had lag as host. I believe both times I suffered major lag was with the play now option. But anyone complaining that this game isn't worth it because of the server issues, well, I'm glad they won't be playing this game because they don't deserve it. This game has so much packed into it that you have more than enough to keep you busy until all the lag problems are fixed but honestly, it's not that hard to find a room without lag either. Either way, there is a full campaign to beat with hundreds and hundreds of collectibles to find, countless hours that can be spent tapping your own imagination and creating a level, many user created levels to play with more going up constantly and some really amazing ones at that and local coop which I've done plenty of and it is a blast!