I think one of the disadvantage of Bitcoin is the bad reputation given by the medias. Trying to push down bitcoin argumenting it is used for illegal activities. For sure, we can't deny this, but oh well, what about fiat ? It isn't used ? Surely more, so what ? They forgot to write about it ? Another disadvantage but hope it will be fixed soon, is the waiting for the transaction, it is fucking so slow.
It's because it's a good niche on the Internet. A currency that only exists on the Internet and is used mainly to buy drugs and kill people? That's a good title for any article and I will surely click that. But if they write an article about cash being used for drugs, people will be all like "Dafuq, of course. Duh. Isn't that normal?"
Btw, only reason that you're experiencing slow transactions is because you pay low fees or no fee at all. It shouldn't be a disadvantage at all because even the so-called high fees is still super low compared to how much we pay when we use Paypal.