As for favorite weapon, I do love the AK, but I'm pretty much speaking for a friend of mine who is very very into AK-47s
Speaking seriously, try them out. Go to the range with him and shoot one (if you haven't) and shoot other rifles if possible. All this assuming you
know AND understand all the basic rules of handling and operating a firearm safely.
I never really liked the AK47, and given the opportunity to shoot one at the range I'm a member at, it confirmed my suspicions. I was not impressed by it at all. Aside from the massive bolt flying back and forth, I despised the sights. Very short sight radius, and the blade sights were just about useless to me. My outdoor range is only 25 yards, so yea you're going to hit what you're aiming for most of the times anyway with that gun. I usually don't form spoken opinions unless if I own or have shot the gun of the topic, which is why I'm usually not budging into all the Desert Eagle debate. If you ask me what shotgun I prefer, I'd say a Mossberg 500 because I own two of them and love 'em. Ask me about a Remington 870, and I can't tell you anything but pure speculation on my part.
Remaining on topic: Since there is an M4 or M4 style rifle in the game, I will use that regardless if any AK type rifle is in the game. I rarely even used the Chinese Assault Rifle in F3.