I haven't heard of them until like 2-3 years ago and I see them posted in World News quite often. What kind of a news source is this? Are they biased in some way? Where are they based? Is there anything notable to know about them?
They are not consistently anti-imperialist, and on certain topics they are closer in their geopolitical stance to BBC and CNN than they are to RT or CGTN. The main positive thing they have going for them is that they are pro-Palestine (as it would be completely untenable for a news outlet of an Arab country to be pro-Zionist).
But you will frequently see them parroting imperialist propaganda narratives about China for instance. And that is no surprise since Qatar is a Western protectorate.
If you want actually anti-imperialist outlets from the Middle East you should try Al Mayadeen or PressTV.