well on the bit about filtering out the LBP1 levels: when you go into cool levels you can press triangle to filter what you're seeing which I use a lot to filter out single player games when with a group and LBP1 levels when I want to play something really new.
A lot of the beta stuff hasn't been made on the full game yet, most of those were just concepts that the creators wanted to flesh out more with all the tools in the full game so it'll be a bit before they're published again. If you just want some random good levels MM picks are a great way to go otherwise there is always LBPcentral.com and you can use LBP.me to queue up whatever you find online for easier playing when you get into the game.
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