I don't like BR simply because you have to deal with sony's proprietary bull!@#$. Yes they're better quality but it's just not worth it to me to have slightly higher quality.
To be fair, they're not "slightly higher quality"; it's a huge jump in quality from standard DVD to BR. If you ever have the opportunity to compare the same film on standard and BR, side by side, do it.
Keep in mind that I am talking about the difference between standard DVD and BR on an HDTV. If you're watching them on a standard definition set, then sure, the difference may appear minor.
But if you're watching them on an HD set, the difference is night and day. As I mentioned, if you let the standard DVD display in it's native resolution (always the best choice for highest quality in any display setup) on an HD set, you're going to get a letterboxed and windowboxed image, i.e. you're going to have black bars on the top, bottom, right and left of the image. Your only other option is to let the set upscale the image, stretching it and zooming it to fill the screen, which degrades the quality even further.
With a BR disc on an HD set, not only are you getting a nice 1080p picture versus the 480p of a standard DVD, but it fits the aspect ratio of the TV properly in it's native resolution.