It feels as though the radar doesn't display the correct distance between you and your enemy and it also seems as though a lot of enemies appear out of nowhere (they aren't on the radar even though they don't crouch and don't use invis).
The radar seems incredibly unreliable since the launch of the latest expansion.
Edit:
I'm really glad that this is getting some steam.
It's very reassuring to know that I'm not the only who is very confused by the Radar's performance since RoI.
Still unsure what they changed, or if something changed.
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I think the real problem here is the lag since RoI. Then reason the radar is fking around is because someone lagged relatively far from you then reappeared very close hence the sudden appearance