Actually, it's pretty nice. You can choose the quality you would like and then need a good video player that will actually play the video. I've used BS Player with best results with my devices. I use PLEX as well and prefer that because I don't use WMC and /or network tuners so no need for the TV recording functions. Add the automatic cataloging and movie art and PLEX wins out for me.
Definitely give Remote Potato a try, assuming your on an android device you want the Remote Media Center app.
If it's an Apple device then there is cost for admission but the product is worth it from my experience with it. Just don't expect any fancy movie art for your library. Haven't used it for a while though so that my not be entirely true.