I have mine some altcoins. Mining is not profitable, except sometime if you succeed to mine at the very start of a coin. But price tends to fall after a certain time. So it is better to immediately sell your coin. Except if you really believe in the very long term of the coin. The cost of mining a coin is like paying the double price of a coin at the current market price. I don't think it is worth to mine any coin. I don't have any ASIC miner, maybe it is more profitable with a specialized hardware. But with a computer and GPU cards, it is not worth the investment as you have to pay your electricity bill and your hardware becomes old faster and can get burned.
The explosion of mining industry in 2017 ended months ago, since the middle months of 2018. At current period, mining is surely unprofittable if you choose to mine altcoins, most of them. Especially if you choose to mine top altcoins, which have extremely high difficulties on their network, and their prices look like shit now. If you don't mine bitcoin, you should not think of altcoin mining now. Instead, using money to directly invest in altcoins now is better. You won't have to suffer uncomfortable feelings from heat emitted from mining rigs.