You can bring a Balalaika to a sword fight, but don't expect it to have the same capabilities. From my experience, aspects and target size, affect all radars in DCS. And on the 21bis this requires me to play with the radar filters and consider the line-of-right of the radar to find an enemy successfully.
If there's anything to really complain about is to demand HQ to give us newer RWR :P , with our current RWR the only way to survive is to behave like a rodent..."THERES A THREAT, WHERE? I DONT KNOW, RUN FOR COVER"