As another commenter said Apple has it right in that it's easy to say "this is the 2013 model". I bought a TV yesterday, and although they seem to have confusing model numbers too, at least the shop displayed them saying which was the latest models and it was easy to see the difference between them (apparently "dual core CPU" is a feature of TVs now).
EDIT: Typos.
I give a lot of credit to Apple in keeping their line fairly straightforward (usually only devs or photo/video people need upgrades) otherwise everyone gets the same base model for one of a tiny number of variants. The prices across channels and concessions are always the same too.
Then perhaps look at whether it is i3/i5/i7 - the higher ones are better.
But then instead of just thinking that your processor is one CPU, count how many logical processors are in there: dual core, quad core etc.
It's still the same - the higher numbers are better :-)
Of course, other things to take into consideration (like it has always been) are FSB speed, RAM clock speeds, disk cache size, disk type, amount of RAM, GPU processing capability (use the same rules as the CPU - count the RAMDAC speed, the amount of RAM, the number of cores), and so on.
I don't think it's changed that much. Just there are more brand names and model names on things now, perhaps?
Surely you just look at the numbers for everything - higher numbers of cores, higher numbers of model numbers, high numbers of CPU speed, higher numbers for RAM speeds and capacity, higher disk speeds etc. etc. etc. etc. ???
Modern computer specifications are confusing. Back in the day it was extremely linear. Oh, your computer is 233 MHz, this new one is 300 MHz, or 450 MHz, or 1 GHz. It was like owning a Supersoaker 2000, and wanting the newly released 3000.
Now, I have no idea what I even own. As someone else said, it's a dual-core something or other. There's no upgrade path, or direction for consumers to follow. If you walk into a store, it's quite confusing, and it's difficult to make sense of all the recent hardware, and I think it leaves people not knowing what they want to buy, or what's even considered an upgrade.