Before they rehauled Google Reader for G+ you could import a YouTube channel feeds into your Google Reader just by copying and pasting channels link into Google Reader, no problem. A link that looks like this used to work:
But, now it doesn’t work any more (I wonder why they broke it and why isn’t it fixed?).. Fortunately I was left with some of the older YT feeds that still worked so I looked at how their links look now. What you can now do to import channels into Google Reader is to use this link form:
Make sure to replace CHANNEL_NAME with your desired channel name and there you have it.