People who don't ping enemies frustrate me.

[prankstar2]

They say things like "they are over there" expecting me to know what they are talking about.  One time they said "he is in that door" while we were in the middle of a large village with about 50 doors. It really isn't hard to ping enemies, if you tap the button a few times it automatically says "enemy spotted" even if you didn't hit exactly where he is.

[BabeGrenade]

Also, you can map pings to specific keys.  I have my 'Enemy Spotted' key mapped to 'alt' so I can tag and move before being seen.