everyone drops when shoots
no one aims and just sprays
I don't want to call you a liar, but from my point of view, your pants are ablaze.
"Everyone" does those things? Please.
Here's the more realistic scenario. You get killed by people who do the pronedrop, and akimbo spray-n-prays (because you fall prey to cheap tricks like that too easily due to inexperience), and have become fixated on it. So now from your point of view, "everyone" does it, because the only time you pay attention to when you die, is when someone killed you in one of those two ways. You're ignoring everything else. Confirmation bias.
If anything, I've been impressed with the variety I've seen in MW3 in terms of how people play online. Sure you get your noobtubers and StrikerSpammers, but overall people gravitate towards weapons and styles that suit them, and people have very different tastes. So far I've not seen a single style/setup dominate (not since they nerfed Strikers anyway).
The next time you play, take note of the gun that killed you in the Killcam, and how they did it, for *every* kill. I guarantee you, your viewpoint will change.