Never used the Mr. Beer thingie....is that an everything in one box kit? Several folks on here do or have done some brewing. Someone has posted pics of a neat brew system he put together. If you like what you get from the Mr. Beer, you'll probably want to expand your options by getting some general brewing equipment and looking at ingredient kits form places like Northern Brewers or Midwest Brew Supplies, or maybe a local store if one is near. The, if you are still into it, you'll eventually want to go from extract, to partial mash to all grain. Then you'll want to keg. This can get as bad as collecting tools and tractor implements.
I've not brewed for a while, but I never made a beer I could't drink. Maybe no one else could drink some of them, but those folks are just wimps.
Chuck
