Well, it's a very competitive market but if you can figure out a way to be unique from the competitors it can have a lot of potential. Remember, being saturated just means people find the same crap over and over again, find a way to rise above it and stick out.
Indeed, I agree with ssandecki you have to be entirely different. It really is how it is with any niche, mobile reviews or book reviews or even a vegetable review. Being different, being of substance still matters!
There is a lot of competition in this niche, no doubt about that. However IMHO you will do well in just any niche where you can provide excellent content / product. Think about that. In the long run only the quality sites will rank high.
That's because most of the niches are explored. You have to be very creative to find a new niche nowadays. And I bet it will get saturated soon after that as well...
i just wonder sometimes, is affiliate marketing is a thing that in most cases is only used as a tool to gain more business profits and only shows how small affiliates are, not every affiliate succeeds, most are failed but the problem is that it is showed as a quick n' earn solution.