Yes, the quality would be high. The limiting factor there would be the compression of the video file rather than the TV itself. The only video you could play on that TV that would really take full advantage of it at this point is either bluray or an uncompressed bluray image of many tens of gigabytes. Anything you download won't be as high of quality as that. The quality can be good, but it won't be bluray good. You could also make a full-fledged HTPC and add a bluray drive for like $100 these days. If you have an extra desktop PC lying around, it's worth the effort.