First off it is kind of weird to talk about weapon "feel" in a video game, but I would argue that different weapons most definitely have a different feel when firing them.
It's kind of hard to explain, but the shotgun in Halo 1 "feels" different then the shotgun in Halo 2 for instance. Personally I really loved the feel of Halo 1 weapons and was really disappointed when Halo 2 came out and I was double wielding SMG's and felt like I was shooting two airsoft guns..
Does anyone on this forum "get" what I am saying about the "feel" of the shooting characteristics of the guns. As far as Halo 4 goes, one glaring difference in "feel" is the turrets both stationary and on the warthog. In past Halo's when you were shooting the turret, you felt like you had a "heavy" gun expelling heavy ammunition, Halo 4 turrets feel super "light" and almost weak. I know it probably kills just as efficiently, but the satisfaction of firing the weapon for me is not as great as its been in past Halo's.
I really like Halo 4, and will be playing it until the next Halo comes out, but developers need to start focusing on weapon feel more, we are not playing pati-cake airsoft, we are elite warriors throwing heavy metal at each other and it should "feel" like that!