I'm mind blown by the fact that none of these new-cryptocoins are getting hacked - there's an enormous bounty out there for who's able to figure out how to double-spend these things! How's it possible that they all work well, but are based on different principles? My conclusion is that there are hackers that are currently double-spending to their advantage: without telling anybody and without making it clear that it's happening.
Also, the whole idea of "scarcity" (which was my main attraction to this field) doesn't exist anymore because of forks: if a group of people decides to fork the software, your coins are duplicated and aren't scarce anymore, so it's not even like gold anymore.
Sometimes I wonder if we'd be better off without a blockchain, and instead with a system where we trust lots of big entities to record the ledger in a way that still allows us to get some level of freedom-of-use, anonymity, censorship-resistance and anybody-can-enter kind of system.