Yes, I've been there. If I look at:
I'm told about physical specifications such as CPU type, memory, storage, etc. I'm not really told what type of application the routers are positioned for in general. I also didn't see any page that directly compares the two, of course its not that difficult to flip between a couple browser tabs and compare myself.
I also have the distinct impression that the http://www.routerboard.com
website focuses on the hardware specifically. MikroTik adds significant value in my mind because of the integration of software and hardware and I'm interested in the complete software/hardware picture not just the hardware.
The previous poster (Art) gave some very helpful guidelines. e.g. RB1xx is for less than 20-30 users max. I realize that features used etc can widely vary performance but some general guidelines such as this is quite helpful.
If the CPU is the same and the clock speed is only say 100MHz greater doesn't really mean a whole lot to someone especially someone who doesn't have much direct experience with the products.