What really bothers me about this channel are:
The selective and biased coverage: I really never knew that Qatar was an utopia! And you can not air religious programs on a news channel. Create Al-Jazeera Islamic channel and air as much Islamic programs as you want, but you can not shove Zaglol's nonsense down our ears as if that was real news.
Demagoguery and intolerance is what they promote: While they claim to be promoting freedom of speech and other things that make them sound civilized, they really do the opposite of that. Programs such as "The Opposite Direction" are all about shouting and slandering, I mean where on earth do you find a news channel where people call each others "traitors" while discussing their different opinions?
Irresponsible journalism: The channel deliberately mistranslated and added to a paper that was published in 2009. The paper recommended a small change in the twig of hominins in the tree of life, but Al-Jazeera claimed that this paper nullified the theory of evolution. (I wonder how many times this theory was nullified according to Arabs and Muslims?) This journalist blasted into smithereens any faint hopes of accepting this poor theory in the Arab world for the coming few decades, and the channel never apologized for this mistake. Not like this is the only scientific or historical mistake they committed.
The suckiest sport commentary on Earth: During the world cup, I was really shocked by some of the comments I heard from this channel; lamenting Mussolini's days, calling the whole of South Americans irrational, and labeling Japan as a developing country, to name only a few. Makes you thank "God" for the option of muting in TV sets.