I participated in like 30 airdrops about 3 months ago, and I have gotten one of them so far. That says a lot in my opinion. I will never do another airdrop, (unless it's a polymath repeat).
airdrop is free tokens, easy job just sign in or register and you will get tokens, but with less tokens and inside airdrop so many shit tokens, i think join airdrop its like just wasting time