Jeez, theres no need to get all heated up about it. Some people are saying they have a problem and notice issues with the playback, some are saying they find nothing wrong with it.
Its all pie in the sky anyway as there are endless amounts of 360 configs (resolutions, pal modes, connection type, the actual movie your playing etc etc) before you even get onto the quality of the display too, or indeed what its being compared to (20 quid Lidl special or a top end unit).
No ones calling you a liar or blind, theres a difference of opinion its as simple as that. Theres really no need to go on a defensive against anyone (except the troll earlier) as we are all talking about the same machine which we own and love.
Personally I just stated I had dropped frames too to help alleviate the OP fears of having a dodgy unit and didnt really expect this to turn into a slagging match between the for and against camp.
Ho hum, another day of internet "debate"