absolutely yes there's is worth buying altcoins. those are litecoin, nem, nxt, ripple, rise, and waves.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
That coins you have mentioned have a good potential in the future, in my case I love to buy altcoins and dump it later. Just like the waves and lisk, I particapated in the ICO and I have a made a good profit on the launch day. Really nice to be part of the ICO, for me, it is a guaranteed money.
ICo's are the best and are guaranteed money. I put a little in each one and then sell them right away in the first pump.
Right now im in LIR and DLisk, best ico's going on now in my opinion.