Let’s run through that. How long did the fight last? Did someone die early? Were the mechanics done right? Did you hit enrage timer? Were you overwhelmed by adds? There are a ton of things that you can discuss without a dps meter…and almost always dps is not an issue in lfg and lfr it is gear limited and mechanics limited almost always.
So you talk about what you saw, instead of an abstract number that might tell you the wrong thing anyway.
In short you discuss the mechanics and make sure people know what they are supposed to do.