Not always but as long as you know the plan and project of the core team of a coin, its not bad to hold. You should always review and make sure before deciding. Its always good to get something from a coin than nothing. Even if its a shtcoin someday. 😉
Now everyone would advice to hold the coins they have until December 2018. The will be a huge change in prices of all altcoins down the line in few months. This would certainly yield a good turn over if you hold now.
Never loose your hope.