Melee attack need a serious update!

I’m encoutering lots of problem with the melee attack.
Playing campaign or multiplayer is the same, sometimes, the melee atack don’t lock and you hit the wind, even if the opponent is right in front of you…
I can see the IA or online player to slide on myself while i’m trying to melee them…
Some rarely times, the melee works like we want it to works, but most of the time, i’m missing the melee attack.
This attack is the best Halo’s attack when you’re near from an opponent, but for some reason, in Halo 4 it makes you die because you will not hit your target.

yea i dont agree with people shooting me once with a BR then running up for a beatdown either, but i do hope they enjoy the tasting blueballs on their faces afterwards giving me extra points for a kill

What melee?