One thing i was fond of in Blops 2 leader-boards was how they categorized different things such as buying perks, opening doors, headshots, ect. It was fantastic and made for some interesting starting points on how to tune my gameplay. I would be happy if they could bring it back, but make it a bit more accessible as far as lobby goes. Maybe a certain feature could be this (one i wish might or could happen): You join a lobby of 3 people and now you have a group of 4. But there is something next to their names along with the ranking and clans or whatever will be there, dots. Specifically up to 3 them, differing for the leader-board settings of each player. Those dots signify statistics in the leader-boards concerning stats that you look for in other players. Example.
I join a lobby and i have my settings for described feature for KDR, points spent on global objects (doors, power, things that affect everyone), and average survival by rounds per game (being how many rounds you live for before dying). (some of these aren't real but to stress a point.)
The dots would be a simple line of dots, signifying your choices of settings in an order of 1 2 and 3. When picking settings, you designate a value for the dots to light up on. In the lobby, when a dot lights up, it signifies that the value of that setting has either been reached or surpassed. Thats the only information you will receive from the dots.
I believe this could work simply because i know of a lot of good players that aren't able to afford or have difficulties with communication, mainly being they have no voice chat ability. It offers insight onto the skill level of the player you are curious about in your lobby. My second reasoning being since credibility of leader-boards are in question, it more specifically allows players a closer and potentially more accurate gauge in assessing skills of a specific type. Yes these can be modified as much as leader-board scores themselves, but why do most people mod those scores in the first place? From what ive seen, its more so because you can say your name was #1 at some point right? Obviously we might not agree that it was deserved, for some all they want is to hold the crown. Continuing on the modding reasoning here, especially since you have control of what stats you specifically want to see, that gives a little more security in the fact that you only see what you really want to see. No one knows what stats you want to see either unless you actually tell them. Not only that but you don't see full statistics either.
So yes while glitchers and modders can effectively stack stats, they can't edit what kind of stats you want to see, meaning less power to them. Not much, but since dealing with them could be harder than we know, its rather small considering the grand idea of a completely honest leader-board.
Crazy and far fetched i know, but the general concept of the idea is to take away some of the power the stacked stats have over us, which is that its seen and sort of recognized and focused on by everyone. Make it harder for their work to pay off, or simply offer a way for people to mod and glitch and have it post on a separate leader-board.