As each day passes there are numerous threads added to the forums about players who want to make changes to things that don't need changed. Most often it's players who are trying to take a weapon that's designed for a specific role and make it more universal or give it properties that don't fit it's intended use. Whenever you're dealing with the public you're going to have those who just don't understand. They can see an orange and fully expect it be an apple. Working the first 6 years of my working life in retail, electronics retail of all things, I know that some folks just don't get it.
So instead of trying to fix stupid I just want to offer some advice.
The talented men and women who made this game are professionals. They've been producing this franchise for nearly a decade and, this is not an insult, have pretty much made the same game since the beginning. They know what they're doing. They have facts and stats to prove they know what they're doing. If something doesn't work the way you expect it to your expectations are most likely unrealistic.
What I'm talking about are those who feel Riot Shields should be weapons that kill easily. Pointstreaks are meant for killwhores. Sniper rifles are close range weapons. A heavily armored, death machine wielding, assailant should move like a ordinary soldier. The list goes on.
Everything in this game has a purpose and it was designed to execute accordingly. Requesting a buff or nerf should not be premised around a desire to utilize whatever it is for something other than it's designed purpose.
It's also important to separate a mechanical flaw from a functionality flaw. Something that is mechanically failing isn't underpowered. It's just "broken" per se. For instance, asking the Riot Shield to be buffed because it's failing to stop bullets coming from in front of you isn't a valid solution. If the Riot Shield receives a buff and it then functions as it should you now have a item that's overpowered. Now if you have a sniper that bolt-action, has high recoil, but very low damage requiring a minimum of two shots to kill then we have a functionality flaw. The sniper is not designed to function as it should.
Another thing that should be considered is that not every part of the game is always usable. Would you call in a Helicopter on Sovereign? Probably not. On a map like Sovereign it would be best to use Support of Specialist rather than Assault as it would serve a more useful purpose. Sure you might have one or two games where airsupport has some success, but generally speaking it's not something you should expect. The same can be said for using a Marksmen Rifle on a tight map. MRs don't have a versatility to handle maps without range or long lines of sight. It would be best to go with a fast firing short range weapon.
When discussing the effectiveness of something you must understand that which you are discussing.