Just like fighting games, good reaction times are helpful but there are many more things involved (confirming a choice out of a pool of options for instance, prediction, and handling factors you could have never guessed).
I accept that I'm a lot slower at purely reacting than I was in the past (used to get like 180 ~5 years ago, now I am at 230) but it's not too much of a difference, especially if your timing, confirming results of actions, and prediction are okay. KDR is around 3.2 which is decent for support/shock trooper.
There are enough cues in the game to not really have to react to much in the game.