I love the game but for now it's -the thing- I hate the most about the game... it's (*@&$# ridiculous how people abuse of the damn 40mm GL. Most of them are walking around with the damn thing ready to shoot and the first time they see any threat they don't even hesitate to launch one because, of course, they have unlimited ammo crate <_<
The worst map IMO for those people is White Pass, which is one of my favorite maps, and every time I try to play it I get somewhat frustrated by the events and am tempted to quit to get to another game more "open" (ie Panama Canal).
Don't get me wrong, the GL -is- useful and fun to play with, but not like all the paranoid player/lil ninjas running around use it. When I play assault I have fun playing with the 40mm shotgun which gets me out of trouble a lot of times... but never the grenade in a (pussy) offensive way.
I have to say that since I'm always an engineer, I use a lot the M2 to breach and blow up walls/barricade/cover to my squad can shoot people behind them and sometimes get a kill in the process, but I would and will never run around with it like you see some people doing and have at level 12 5 or 6 golden star with it like I saw a bunch of people having <_<
But meh, what do you want to do, it's the game and you can't change it... though people might change and start playing for fun and admit defeat when they are overwhelmed by another player, but you will never see that happening in a thousand year
I played in a server which had about 5 or 6 guys in the top 25-50 in the world (two of them were in the top 10) and boy did my friends and I raged at them haha... nadenadenadenadenadenadenadeknifeknifeknifenadenad eknifeknifenadenadenade and somehow walking/strafing sideways and getting headshots with the m60 without aiming, but I would guess that the part of their live that they lost morphed into skills so I'm not whining

(though it was funny to see people with like 7-8 golden stars with the GL -_-)
(edit) ...oh and don't get me started on the -retarded- knife