Why do my Blu-rays look like soap operas now??

[Preeminent]

Hey guys,
Great site. I just jumped into Blu ray. I recently bought a new LG player with netflix/youtube streaming and love it! While at Best Buy, I walked into their home theater room and they had Pirates of the Caribbean Blu Ray playing on about a 50/55 inch 1080p LCD screen. It looks insane! Super crisp and clear. Every little detail is visible. Like you are actually on set watching them act out the movie. My question is this though: I only have a small 22 inch 720p Lcd screen(with HDMI for both audio and video) and it when watching Blu Ray-We Were Soldiers, it obviously doesn't look like that. I mean it looks good but really doesn't look that much better than regular dvd. Is it because Pirates was such a great transfer or is it because I only have a 720p tv?