I find that my center channel needs to be turned UP for some movies (mostly newer ones) to be articulate over music and sound effects, but in the case of some of the 70 mm blockbusters of the '50s, '60s, & '70s, the center needs to be turned DOWN because the people who transferred the film to disk either held back the music compared to the glorious road show originals, or slapped a limiter on it.
So ... the center may need to be reset for certain movies.
I have a friend who just uses the little speakers in his TV for DVDs (The Horror, the Horror) and he reports that the dialog is sometimes lost, so that, combined with the experience of those of us using good sound systems, sounds like the mixes are iffy.
Gary R Camp
Main room: 2- 1982 Klipschorns with K-401 fiberglass mid horn upgrade (1987), and AK-4 Klipschorn stock upgrade (2006), Belle Klipsch (2005) center channel, 2 NAD C- 2 72 ss 150 wpc stereo power amps (not bad), NAD T163 home theater type pre-amp (Achilles heel: no way to avoid transmitting slight hum to Khorns), Heresy II surround speakers driven by 1/2 NAD C-272 and a Yamaha 135 wt amp, NAD C-542 CD player, Magnavox DVD player, TV monitor. Klipsch RSW-15 subwoofer, for movies only.