Here is a nifty addon that provides information about raid RNG in terms of damage and healing output.
It shows the Critical Strike Damage and Healing done as well as the Multistrike Damage and Healing done. You can also further break down the analysis and look at how much each spell contributed to the fight. And lastly, you can check to see out of the total spells cast for the fight how many were crit/multistrikes.
Pretty cool when comparing to other classes/specializations in your raid!
I use it to selfishly compare myself to another Boomkin to see where my RNG has failed me, or helped me lol.
http://mods.curse.com/addons/wow/raid-rng
Pictures included in link.
Enjoy.