Well Slurpee I believe that it should be an important stat. This is the only stat that shows you how you'll end up doing in the long run. A nice sample would reflect its share of tilted sessions, bad beats, wins where you had less equity and won, upswings and downswings etc. So essentially this stat sums it all up to one nice figure.
I have read in many articles that usually the benchmark is 4-6 bb/100 hands but I think it should be different for micro stakes.
There are usually more fish at micro stakes so you have a higher win rate.
But looking at it from another angle, the percentage of rake paid at micro stakes is higher than that paid at higher stakes which also affects your bb/100 rate. I haven't really found, anywhere in my search, as to how much a good winning player should have as a bb/100 rate (at micro stakes like NL 5 and NL 10) which is why I started this thread.
People who have climbed up the stakes would definitely notice that their bb/100 rate at micro stakes would be significantly different from what they earn now.
But I do agree that the sample size would have to be a bit higher to reflect as many situations and trends as possible.