User blog comment:Callofduty4/CoDWiki news - 8th December '13/@comment-7057695-20131208004911/@comment-6565193-20131211142117

In all honesty Sammy, If you were to compare two Call of duty games that are most similar then Mw2 and Mw3 would be the games that are most similar to each other.

After all Mw3 is basically a very direct continuation from Mw2, just different weapons and slightly advanced graphics. Black ops 1 and black ops 2 are more different from eachother compared to mw2 and mw3