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 really agree with your opinion, for the year is very different from 2017, now (2018) the existing airdrop is not like 2017 which has a high selling value, for 2018 almost all airdrop are not worth any mostly into junk coins.