It was a mixed bag. HR people are always nice, but techies... Well, at first there where two dudes that were not Unity3D devs, so they had a night of googling to find out which questions to ask. That wasn't at all bad, actually. They were nice and I had a good time. Then another dude came. He was (and is) senior C# developer with a huge ego and really looked down on me, so that was unpleasant. He asked a bunch of tricky question, particularly about bearded OOP theory. I didn't had any troubles with the questions themselves, apart from being obscure and not really telling about my performance, but the attitude... I really wanted to take a shower afterwards, lets put it that way.