As long as all the applications are working; working with a more than acceptable speed?
Apple doesn't bother to advertise any device internal technical numbers anymore apart from the storage size (see iPod/iPhone/iPad) to avoid direct comparison with alternative products. They focus on the usability/ergonomy/design of the device => user-experience.
Fair enough:
At the moment, the power of most computers on the market are completely overblown for the usage of the majority of users anyway. It hardly matters if there's 2 of 4 GB of RAM or the CPU has 2.8 or 3.2 GHz of speed when you use a web-browser (apart from Flash though

), write an email, use a word-processor and so on. Only when using more specialised functionality like picture, film editing etc. additional technical functionality/power are necessary.
Of course the boundary will be moved over time, but the CPU speed for example doesn't increase as quickly as it did ten years ago anymore. (There are not too many mainstream applications that actually use multiple CPU cores at the same time either.)
T
he consumer decision should be based on "does this device do what I need/want it to do?" and not "does it have 256 or 512 MB of RAM?", because it is irrelevant when the first question is answered.