I stopped playing COD at MW2 because I found that it just wasn't fun anymore and that it was the same game release after release, and I was starting to lose faith in first person shooters since BF4's abysmal release until I got my hands on the Titanfall closed/open beta. I was amazed at how smoothly the wall running mechanics worked with the concept of a mech game. The multiplayer Campaign is pretty great and you do get a sense of an amazing story, you just need to understand how good SciFi is written.
P.S.: Pay no attention to the PS4 and COD fanboys that gave it a 1 they/re just sore that it is only on xbox and pc.