I like the couple of "universal" things about the PS3: universal power supply (just grab appropriate computer cable), region free games, easy importing.
I haven't used it as a BR player much, wireless built in is nice to have.
Easily swappable hdd although in order for it to turn into my main platform for keeping my video/music on it, it would need a whole lot more in support for various formats and codecs.
Reliability.