I’ve never used a Mr Beer kit but I've heard of them. When I first started I used extract kits that consisted of crushed grain, dry malt extract, liquid malt extract, hops, and yeast. With those you did your boil or brew. You can make a pretty decent beer with extract but nothing like all grain. All grain is what I have done for the past several years. I crush my own grain and brew exactly as a brewery would, just on a smaller scale. This gives me the ability to brew a beer just as good as any brewery. Often times I try a beer I really like and I start working on a clone recipe. Usually within a few tries it’s hard to tell the difference between what I brewed and the store bought one. From what I understand the Mr Beer kit has basically everything in a can, sort of like a beer concentrate you mix with water and ferment, no boil or actual brew. I don’t want to sound critical but I can’t see that being very good. I would compare it to a just add water soda extract compared to a CocaCola. It may be drinkable and it may give you an idea if you want to continue the hobby and upgrade. Usually when people are first starting out I recommend a starter kit like the one linked below and at least a seven gallon stainless steel pot.
Also, a great book for beginners is How To Brew by John Palmer. You can buy a copy or read the entire book online. Hope this helps. Cheers!
Thanks for the links HopVol! I am interested in getting into this hobby, not like I need more hobbies!