Any counter is just a warm fuzzy feeling for the user and really of little use (wow, my firewall stopped 1000 attacks, it the ones that it doesn't that will hurt), you have nothing to fear with the stuff it stops, just the stuff it doesn't stop and there is no counter for that
Whilst my firewall does have an attack detection plug-in, which is a lot more than a simple counter I rarely ever check my firewall logs unless I'm suspicious or often fault finding to see if something has been blocked. So the outbound and inbound blocked logs can be useful in fault finding, etc.