I really dislike that in 20 years people have failed to figure out how to extrapolate power dynamics from a 1v1 environment to group v group.
Allow me to explain:
We will use Frost Mage as an example. Two separare encounters.
Group #1
Frost Aff RDruid Sub MM Hunter.
Vs
Arms Combat Ret HPal MM Hunter
Group #2
Frost Aff Sub Disc MM Hunter
Vs
Arms Combat Enh RDru MM Hunter.
Which Matchup do you think the Frost Mage is going to have a larger impact in?
Bonus question: Which matchup for the Arms Warrior?
Hint: these two answers are linked.
Now think about why.