I haven't played this game (don't have any consoles) but from what I heard, it's good. However, the idea of getting an MLK might be flawed in its core:
I tired getting an MLK meet up in an MMO: Myst Online, Uru live before.
As much as the idea of having a bunch of members meet together in a game is great, I think that the most you will see in any one place is the MLK Minecraft Server (which I hear gets roughly 10 people joining).
This is also assuming that enough members have a PS3 and LBP.
According to this list:
viewtopic.php?f=158&t=21558it's not that many members. My best advice is that if you want to get a MLK get-together, use a simple, light (on system requirements) and free PC game instead of a console game.
I was more successful in finding a member to play games that we both have, but that's a 1-to-1 case, that is quite impossible for groups larger than 4 people.