One thing I hate and I am sure others hate is how fucking early they spawn. Sometimes 90% of each team is still alive and someone caps the flag on low population (like 10v10), and nobody really gets to play. Sometimes I will play on china and flags almost never spawn, and when they do spawn it seems like at a good time when there is one person alive (usually ranged), and it will either force him to move in or the flag simply gets captured.
I am not against flags they can be a great thing, but right now its more of an annoyance when they spawn in the first 30 fucking seconds of the round.