@Mischa
PressTV is actually the ONLY news channel that I know of, that is reporting the news in English, from a seriously alternative perspective. They are filling an imporartant niche that no other channel fills right now. That's why I think it's worth watching. The Iranian connection is almost irrelevant from this perspective. It gives an alternative view, particularly on the recent events in the Middle East.

People can judge for themselves: http://www.presstv.ir/live/

I keep a critical perspective when watching them though - and it does not mean I am a supporter of the Iranian regime (I am neither in favour, nor against). I have no illusions on who pays for PressTV - and I realise that they will never give a fair view of the Iranian opposition.

They actually almost never mention Iranian internal politics though; The things I can recall are a very complex story about how different Iranian government bodies had difficulties working together and hints at corruption. Plus there was a report about how Iranian IT specialists managed to disable the computer virus released to target its nuclear program. Finally on the day of the Egyptian revolution, per PressTV, one hundred thousand people were on the streets of Tehran celebrating the Islamic revolution, and supporting the Egyptians. Judging from the footage, there were definitely a lot of people there, demonstrating. A few days later, Western media were reporting massive anti-government demos in Tehran - although there were no reliable pictures since Iran had banned foreign press from covering the demos. PressTV said it was a few hundred people and showed pictures of vandalism. Seems to me, the truth is probably somewhere in between.

Other interesting points:
They are not in any way trying to preach Islam to their viewers.
If anything, they are quite strongly Left/socialist biased. Their reports from Europe are about workers, immigrants, environment issues, the anti-war movement etc. Same with their coverage from the US. They cover people, causes and movements that no other channels report on - important news. As a European, I can confirm that there is no hype or excessive agenda in what they are showing/saying about European current affairs.
They also cover really interesting human interest stories from East Asia, Africa, South America. Not sure where they are getting their material or ideas from, but these stories in particular constitute very good journalism.

In terms of serious bias; they really don't like US foreign policy, or anything at all about Israel. This is extremely obvious. Can't help but wondering what they would like to happen with Israel and the Israelis.