I love the freedom about SL, that you can create (or buy) nearly anything. But on the other side its very hard to get into due to a bit of a learning cliff just to get used to the basics.
But if i could only change one thing it would definitely be how land is set up. The current way it works is far, far too complicated and most of all too expensive. Granted I'm mostly here for RP and similar so I'd love anything that helps increase diversity in the RP sims available. But as running one is prohibitively expensive the cost simply gets in the way and causes anything not backed by someone wit