NuBits was the first to be rekt by the crypto bear market followed by SBD and BitUSD. DAI is still doing okay but my view is that is mostly because it is relatively new and tiny compared to its backing asset, ETH. Given a bit more time to grow before the crash (or with a faster and/or deeper crash) it would likely end up looking a lot like BitUSD.

It appears they all suffer from the same limitation which is simply that too-rapid and too-severe depreciation (aka crash) of the backing asset isn't something they can absorb while retaining stable value. We will need to evaluate these solutions not in terms of retaining stable value unconditionally (which appears impossible) but in terms of the magnitude of the shocks they can absorb and their ability to recover. (NuBits, for example, still hasn't recovered after several months and now trades around 0.05.)

I expect this is something (at least for now) that users of algorithmic stablecoins are simply going to have to accept as a necessary tradeoff for not having a counterparty and everything that goes with it (for example all of the new custodial stablecoins have features which allow the issuer to freeze your coins).