Its only worth it if you know for certain that in the near future the price of bitcoin and altcoins will be much higher than it is today. However in that case you can just buy the coins directly.

However with cloud mining you need to understand the terms. Usually when mining goes below a profitable mining point, the contract will be void. So most likely after what just happened recently, unless the price rebounds and stays above maybe $8000 or so, then the contract will be voided and you won't get any mining profits anymore. Just doesn't make sense to cloud mine. Either buy the hardware and mine yourself or just buy the coins.