Here in the UK, watching on BBC3, the sound was horrible on all but the last five songs. The first five especially were awful with the sound- the one microphone overpowering the rest, with every shake of the voice heard, not even Aurela Gace sounded ok. I could barely make out the music with Jestem and Haba Haba.
The songs with bad sound that qualified were the ones with the best performance from the lead singer, and the best visual aids. This helped Switzerland, Serbia and Finland. Iceland was far from perfect vocally but sounded bearable, and they had enough charm and a good draw after Croatia to help them qualify. Russia put on a good show and Alexej sounded ok, even if not heard at times (when a backing singer was supposed to take over). Eldrine actually sounded good, the lights and stuff gave a good atmosphere and the vocals were probably the best until then.
With hindsight, and discovering that Turkey and Armenia won't ALWAYS qualify, I understand the result. It's probably what I would've predicted as the result after seeing it all on screen.
Saying that, the result was also completely unfair due to all the technical problems- Germany really have to up their game for Thursday and especially Saturday!