I'm used to it by now, but I still absolutely hate it. It's next to useless, since people will easily sneak up behind you without showing up on there at all. There are many times that I walked into a room, only to get instantly murdered by 3 enemies who were in there that didn't show up on my radar.
This sums it up nicely. Running into an area at top speed with no blips on radar, then getting destroyed by the entire enemy team. I'm convinced it straight up doesn't show the enemies sometimes.
I get the arguments about using audio cues and playing without, etc., but radar was an integral part of strategy for a lot of longtime players.