Personally, I don't care what each cell IR and C rating is. It would be much more useful to know what the assembled battery can do. A standardized test with no connector and a nominal lead length (say 3 inches).
How many watts can I get out of the battery...
1. Safely (recommended max discharge rate, any higher and you are shortening the battery's lifespan)
2. Before predictable failure (Discharge rate at which permanent battery PACK damage occurs such as puffing, solder joint failures, melting wire, etc...)
There are people who take care of batteries (racers) and there are people who abuse batteries (bashers). Bashers far outnumber racers and they are the ones who need to know that if they try to run "this" 3s 3000mAh pack (meant for an electric plane) in their overgeared Savage Flux that it is probably going to end spectacularly at some point. The racers only need a voltage over time (at a set load) or watts over time graph to decide what battery will have better punch. And like has been stated a few times, a load and a data logging ESC can give you that.
I for one would love to be able to buy a one-box battery dyno that can tell me how an assembled battery pack performs. This way you can also accurately observe how your batteries degrade over time from use/abuse.