Give your heads a shake!! This is the Home Theater category, not a place for anti-HT/2 ch.-only guys to post...
Just for the record, I love my two channel music system, and I've spent way more money on that system than my home theater.
However, listening to a movie in stereo, when it was designed and mastered with a good multi-channel mix, with the director's approval, for the best performance possible, is ridiculous!! You miss so much of the intended effects and rob yourself of the best performance. It's like watching pan 'n'scan instead of widescreen - there's information missing!!
Of course, there are always exceptions, and yes, a lot of music concerts sound better in two channel PCM than they do in "compressed" DD or DTS. But overall, the multi-channel mix in movies is the way to go.