Thanks again for ideas. Yes, well, the freelancers I use don't have an interview - I think I'd be better at hiring people than finding the right freelancers. I think it would also be easier to manage employees than subcontractors... It goes so that I call around, and then go visit the one that seems good based on the phone call. These are mini projects of a few hours (freelancers work from their home or office, usually it's a one person office).
By 'technically better' I mean for example, that I've already tried out different 3D modelers and them using different software. The freelancer that I'm using now is using the 5th 3D software that has been used for my project, and only that one works (as the 4 previous SF couldn't do what I wanted design-wise). So right now I'm just looking for someone who can do the job. If I was hiring I'd look for something else too. One of the freelancers on the other hand seems very reliable, but I think he might have his own art projects interfering and I think he might suffer from depression. But he's one of the best generalists I've met plus really good at details, so I'd actually consider hiring him as a first employee in time (would be much easier to motivate an employee). So paradoxically, I think he might be a good employee (at least worth trying for the trial period) but as a freelancer subcontractor he's been average.
I could use project management tools later, but right now I didn't find one that would be good for product development (tried DaPulse, Slack and Asana). In the future I'll still try the one attached to Zoho Mail system. Creating a whole new reputation platform sounds like a new business idea for someone that I wouldn't have resources for. I also don't feel comfortable sharing negative comments about someone in public.
As I have a very young startup and I'm mainly doing everything on my own I don't have time for big changes about working with freelancers now. So "light weight" tips for motivating them is what I'm looking for, and tips on how you guys choose where do order work performances from based on phone calls and quick visit would be nice too.