People (including myself) classify it as a noob weapon because it’s just random spray n’ pray. Yeah, the semi-auto or short-controlled-bursts may be a lot more skill-based. The problem is, using those techniques isn’t really required. Some majority of the Assault Rifle users tend to spray n’ pray all the time, and they score a good amount of kills with it. If players are able to use the weapon in a nooby way and be rewards with it (by kills), that’s why many consider it noobish.
Personally, here’s what I would’ve done with the Assault Rifle. The first few rounds in a burst deal a little higher damage, while spray n’ pray is weaker. That would make spray n’ pray extremely difficult to do, and most times players would die by attempting to use the weapon in a noobish way. The skill-based way of using the Assault Rifle would be essentially the ONLY way of using the Assault Rifle, which would thus remove the noobiness from the weapon. They need to find a way of further discouraging spray n’ pray tactics.
Now, I actually believe spray n’ pray can be done well too, but the concept has to be implemented better. I’d prefer that to be done with the SMG, which also should be rebalanced. I’d give the weapon some massive vertical recoil, it would essentially be the H2 recoil on steroids. The recoil would also start immediately when firing, instead of having a delay before the recoil begins. This would mean that keeping the crosshair pinned down on enemies would both be a lot more challenging to do, since managing the recoil is a lot tougher of a process. Not to mention, the spread or falloff damage would mean you would also have to get into near point-blank range, just like the SMG already is. As far as the SMG goes, once you’re in range, there’s not really much you have to worry about, which is why I consider it noobish. But if you drastically increase the recoil, and make the weapon based more around the recoil management, that wouldn’t be an issue. And it would still deal enough damage to be rewarding at that close range, the player would just need to learn how to be accurate with it.
But back to the Assault Rifle. Part of the reason I disapprove of it being a starting weapon, that’s because Halo always had stronger emphasis on precision, and a spray n’ pray starting weapon heavily contrasts that aspect of the formula. HOWEVER if they implemented my suggestion, it would ensure that spray n’ pray would no longer be an option. This means that the Assault Rifle would actually feature a stronger element of precision, so that would better keep the weapon in-line with the core formula which was established in the previous games. While it would still technically be an automatic, it would instead always be used like a short-controlled-burst weapon, as you’d get immediately cream-stomped by other players for recklessly mashing down the trigger. In a sense, the Assault Rifle would BECOME a precision weapon, which I believe is the route they should go in Halo 6.