Kat L.

For both sellers and buyers, having been both on this site.
Sellers Side:
I used to sell graphics, I was actually one of the people that took time and put in effort when working on orders (unlike a lot of people there), but the commission fee (20% + $1 off each withdrawal) is way too much if the lowest price is $5 (which is what most orders go for)
The customer support is useless, if you have a serious question, they will just ignore you!

Buyers Side:
Most work provided there is crap, these so called writers use word spinners, 99,5% designers use clipart for logos of templates for other stuff (business cards, flyers etc), lots of copyright infringement, most work in their gallery examples is fake.
A saxophone player guy that I ordered from actually used a virtual instrument instead of an actual saxophone to record the solo.
The list goes on.

Long story short, the site is just overall crap, they advertise themselves as a place for professionals, but the majority of the people there don't even speak english nor have the base knowledge of the thing they advertise they can do.

Oh and something interesting, even if you get a refund from a seller, your money stays there as a "Fiverr Credit" which means you can't get it back on your card / paypal.