Most reviewers wouldn't have been all that into Titanfall 1. Given TF2 multiplayer feels so much like CoD now, I can understand the "improved multiplayer" calls. Given they all love CoD.
For perspective, a CoD game hasn't gotten a Metacritic score as high as Titanfall 2 since MW3.
Black Ops II (360): 83
Ghosts (PS4): 78
Advanced Warfare (PS4): 84
Black Ops III (PS4): 81