Airdrop worth it and does not worth either cause 90% of airdrops are time waster which is why I usually go through airdropper site study their project and roadmap before participating in any. However, most people thing airdrop tokens were given to participants for doing nothing but if you ask people that know the power of information/advertisement they will tell you that you actually did something.
I completely agree with you that almost 90 percent of all airdrops are worth nothing and they are just a waste of time. Though of course they don't require a lot of efforts to do.