I've spent the last couple of days playing around in Bittrex with a few different altcoins, and I'm slightly down at the mo. It's hard to see much of a pattern across the board, though I get the feeling that there are quite a few people doing much the same as me, and investing without any real interest in the coin, just looking for quick bucks. Which is making the whole thing very unstable. I tend to feel that Bitcoin is safe, Ethereum I'm less sure about, and security of investment drops off pretty quickly once you get below Ethereum's level of capitalisation. In part because a small amount of investment can have a massive effect on the less capitalised coins...
Not sure if that's much help on Ethereum in particular though! :)