No, this is only 2018 current condition. If I compare with last year (2017) there are many legit airdrops. Like BLUE, ELTCOIN, EREAL, BITWHITE, REBL, and many more. So, I can say 2018 is the worst time for airdrop. I think the last Airdrop which gives good token was POLYMATH.
I agree with this, I think this year has a lot of scams, because of the hype of many people about bitcoin, ICO and airdrops, scammers take this opportunity to take advance. Last year, I received some legit airdrops, I just regret of not selling it when their price goes high last year. So I have nothing to do, but to hold those coins and just wait again if it will give me a nice profit of holding it for a long time. This year I gained nothing from airdrops only small amounts of token with just cents in value.