I took part in 3 interviews, which were conducted in a really nice and professional way, apart from the last one during which manager seemed to be stiff and not really fluent. But it's not a big problem - the worst part is the fact, that I haven't received any feedback and recruiter stopped responding my messages. It's very impolite and not professional - I wasn't asking for much - just an information what was going on and what do we do next.