I have an older Onkyo (TX-DS575) that has the re-eq feature, but I leave the feature disabled. My room is relatively small and has plenty of soft surfaces, so it does a good job of absorbing harshness on its own.

I think that if your room has many hard surfaces, then it might accentuate brightness, in which case you may benefit from enabling the re-eq feature. Keep in mind, also, that not all movies are mixed the same so some might be more bright than others.