As a user, more apps/games. Splinterlands is just one example. I mean look at ETH. There are so many games out there based on eth. With our fast and zero-fee transactions, it would run so much better.
As a developer, better documentation/tutorials. The current documentation is really bad. It's confusing and not well documented and there is a lack of tutorials. At this point the developer page still points to the steem docs.