Dribble is a great place to look at the visual design component of the work -- which, I should remind people for the nth time, is not UX. It can be a part of UX, but UX is problem solving, not "how it looks". Of course, there are great visual designers who are also great UX designers, and some of them display on Dribble, but it's a terrible place to evaluate actual UX ability and skills.
There are tons of amazing UX designers who can learn about your users, make your app/page/store/whatever work amazingly well and delightfully, but who can't draw a straight line. And there are a lot of people calling themselves UX who can create beautiful artifacts but who will be stumped when it comes to figuring out how something should work and why, based upon real users and their needs.
Evaluating the latter requires time and a willingness to learn about the subject, and the humility that goes with it. So whereas Dribble is a great place to look at images, it won't help you evaluate who is a good UX designer and who is a good visual designer.
(Related note: more and more top-level company founders and executives are learning this the hard way, and are pushing back against people who have lovely portfolios but only have, say, 10 weeks of General Assembly as their UX experience. Long story.)
