User blog comment:KATANAGOD/Black Ops 2 Logo and Trailer Release Date Leaked/@comment-2243577-20120410235239/@comment-1263839-20120411000235

Black Ops did introduce new things to CoD.

Like the CoD Points, which I enjoyed because people could easily power level by picking up an enemy gun and getting the kill challenges aswell as the challenges on their current gun, Black Ops stopped that by making you buy it. Pro Perks too were made harder to get, and cost a large sum of CoD Points to buy.

The Dive-to-Prone was a good addition, although it's primary purpose was for useful escapes or useful kills in Zombies.

Wager Matches were a good idea, and had some pretty fun (or at least enjoyable) game modes.

Black Ops didn't get much of a hacker invasion, they still haven't gotten into the main games yet (like in WaW and 4), and MW3 is badly invaded with derank lobbies etc.

Basically, the list is:
 * Dive to Prone
 * Useful mechanism and was fun to use (and would of been good in the MW campaigns)
 * Combat Training
 * Allowed stress-filled players to relax and get some easy kills.
 * Theater
 * Whilst unoriginal, it allowed people to watch back on their achievements.
 * Pro Perks are harder to obtain as they require three challenges (rather than one repeated a couple of times).
 * CoD Points
 * Removed easy leveling with Guerilla Warfare
 * Pro Perks require some extra time playing in order to obtain them in Points.
 * Wager Matches

Also, MW3 was just a copy paste of MW2, in sounds, noises, guns, perks and most death streaks.