Actually, I find it pretty useful. I prefer it than the mini-map since it's already right there without clicking anything. With it you can see where your teammates are positioned, where they are killed, and get hints of where the enemy is coming through.
If the enemies would be shown then it would make the game way too easy, with no doubts but simply finding the enemy and killing him.
E.g: If it's a 3v3, and I see the 3 enemy players focusing on the right side of the map, since the AC maps are small, you can go through the left side, get the flag, and when returning just checking where the enemies are and avoiding them, since they would be looking at you in the radar as well. The game would turn then into a: Look at radar > Find > Kill > Repeat.
In other FPS's like CoD (I think?) you can see the enemies on the radar but it works in that game because normally the maps are big enough, that knowing your enemy's position is not enough.
If the enemies would be shown then it would make the game way too easy, with no doubts but simply finding the enemy and killing him.
E.g: If it's a 3v3, and I see the 3 enemy players focusing on the right side of the map, since the AC maps are small, you can go through the left side, get the flag, and when returning just checking where the enemies are and avoiding them, since they would be looking at you in the radar as well. The game would turn then into a: Look at radar > Find > Kill > Repeat.
In other FPS's like CoD (I think?) you can see the enemies on the radar but it works in that game because normally the maps are big enough, that knowing your enemy's position is not enough.