Most of their articles and videos seem to be quite objective. Might be run as a way of raising awareness (every once in a while) of Middle Eastern progress, but I certainly wouldn't call that propaganda.
As for Israel, I feel like Al Jazeera isn't one-sided; there simply are more articles about Palestinian deaths because there are more Palestinian deaths. Even when around 20 Israelis across a few attacks died at the end of last year, with each death heavily reported around western media, a comparative death toll puts it into perspective: http://www.aljazeera.com/indepth/interactive/2015/10/mapping.... It seems that one side simply has better weapons, and so, causes more deaths.