With the way most of the population uses laptops, the rMB is more than sufficient.  I read a lot of post talking about 1.48 pounds.....that is a pretty big difference when you are talking about devices that only weight a couple of pounds as is.  Also the point of a single port, to many this is actually better and not worse.  For example, I dock at work.  Instead of having an HDMI cable in one end and a power cable with printer in the other end, I can just leave everything plugged into the HDMI adapter and plug that single cable into the macbook.  That is actually easier.