Hi there, I'm the CEO of Freelancer.com. I'd be interested to know what problem you ran into?
* If you post a project on something like C++, Android, iOS or web design you get about 10 generic bids in the first minute. I suspect some coders use bots to bid on certain categories. This should be strictly prohibited.
* Not sure how you can stop the coders to bid so low, when a guy bids $30 for 2 - 3 days of work the quality of his work can't be that great. Maybe enforcing some minimum bid limit ? I know this is a hard problem to solve.
* Another problem that seems to keep the prices and quality down: coders that take a project and repost it with a much lower price.
* A buyer should be forced to describe what he needs in the project description. Generic projects like Easy work, it can be done by an expert in a few hours. Details after you bid. should also be prohibited. These kind of projects keep the prices and the quality of the work down for everyone.