Hadn't heard of BURSTcoin yet, so I can't say anything about that particular coin. I think in general, crypto currencies that offer something more than just being a currency, something that adds real value to the coin (like Steem does) will skyrocket eventually. Happened with Ethereum and I think it can happen with MaidSafeCoin, Synereo and LBRY, that's the coins I've invested a bit in.
MaidSafe is a fully decentralized internet, Synereo a social network like Steem, LBRY a decentralized media distribution platform that lets you sell your content (videos and other files). All still in development but already usable to some degree, with the exception of Synereo which is about to release the first piece of software this month.