My question is if it's still worth buying Asic's and start mining BTC in 2018.
If not mine BTC what other coin is it worth to mine nowadays?
I think there are some other similar threads are available on our forum so it is better to search before asking questions.
The bitcoin mining profits maybe not effective because of increase in the mining difficulty of bitcoin but it still give earnings.
I suggest you to mine monero because difficult level is very less and the coin is also undervalued so if you can mine some monero nowadays it will give good profits when its price bumps.GPU mining is the best available way to mine monero.
I agree with your opinion, monero still has the potential to mine, but it should be noted that at the moment the situation is very bad, because market prices have fallen sharply, so if they mine it might not be able to make big profits.