I don't like the arbitrary minimum rate but I do see how it would differentiate you from the rest of freelancing marketplaces. I think it would be better to have different minimums depending on category and type of work. There is no reason why data entry or similar should start at $35/hr, It just shouldn't be $3/hr. Could also have different minimums for different countries, freelancers have different standards on what's a good hourly rate, many of them can do fine with $20/hr.
Other pain points to address:
It's very tiring having to bid on dozens of projects and never getting any work. This is a major problem for new freelancers. You have to lowball dozens of bids in hopes of getting your first ratings.
Something like Odesk's tests for freelancers but higher quality.
Buyers should also be reviewed not just freelancers. Putting money into escrow before accepting a bid should be mandatory, at least for new buyers.
I've used about five different freelancing websites in the past but it's been a while since then and I think a lot of problems are not coming to mind now. I'll let you know if I think of more pain points I would like to see addressed.
EDIT:
I tried signing up but my current address is not in a country listed in your dropdown menu. I don't see why you would limit Europe to a handful of countries. If you can do business in one EU country, you can do in all of them thanks to the economic union.