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.
Exactly most airdrops this year are all garbage not like in the previous year. Scammers are riding the crypto trend to get some loads of emails and build a group in telegram or on their social media accounts.