We have looked at rateitall.com and it seems like they are doing some things really well. My feeling is that they're much more product/service focused than MakeFive is at this time, but that may change. We have talked about the notion of encouraging users to post their thoughts on some of these topics as well. At this time though, it seems that the dialogue on MakeFive is often more centered on pop-culture and such.
I think one big differentiator on MakeFive (at least I hope) is design and the general experience. We're really putting a lot of effort into making the site as intuitive and responsive as possible. In fact, after going live with the most recent rebuild a week ago, we're already reworking some of the primary pages to make them easier to use.
Your comment about the "if you have a brain" is certainly one we've considered carefully as well. Some likely won't understand or appreciate our particular sense of humor, but, we sort of think it's good to have a little fun with the whole thing. That being said, your point is well taken. :-)
Thanks for your feedback!