Well, I guess I'm one of those rare "middle-of-the-road" people when it comes to Mr. Beer kits.
First, lets get something out of the way. Is a Mr. Beer kit the most nuanced, complete introduction to homebrewing? No. Will you brew a jaw-dropping beer that bears a certain something that is uniquely yours? No.
Is a Mr. Beer kit easy to use? Yes. Is it an excellent, if somewhat oversimplified introduction to the hobby? Yes. Is the kit fun to use? Yes. Is it a compact, efficient system? Yes.
One of my friends used a Mr. Beer, and he (we) really enjoyed the results. It wasn't exactly the best beer we've ever tasted, but the flaws are easily overlooked given that it was homebrew.
So, if you're looking for ease of use, then Mr. Beer kits are fine. If you have fun using it and drinking the beer from it, then more power to you!
Only a few things to keep in mind.
- Sanitize, sanitize and sanitize. Proper sanitization is paramount, and isn't really that hard. Soaking in a weak bleach solution and then thoroughly rinsing should be fine.
- If you ever graduate from a Mr. Beer kit, watch out for light. The Mr. Beer kit fermenters are opaque, but most others are not. So bear in mind that if you ever use a larger, clear fermenter you will have to keep it out of direct sunlight or flourescent light or it will end up stinking of a skunk. Some people forget about that.
- You'll be using a pre-hopped extract. This really limits the amount of customization available to beginning homebrewers. Remember that if you ever "move up," you'll have much more control over the final taste of your beer.
- Pick up The Complete Joy of Homebrewing, How to Brew or the Homebrewer's Association's Introduction to Home Brewing brochure (which is free!). They are all excellent resources. I started with The Complete Joy, and I still hold it as the finest introductory book. If you ever get really into it, pick up Brew Chem 101.
So don't worry. It should come out fine. Really, beer kinda brews itself, so long as you PROPERLY SANITIZE!
Let us know how it turns out!