Vanilla was all about gear. I'm talking about pure skill related pvp and none of that boring 1v1 crap, 1v3+ is the way to go.
3 is that perfect number where you're not just ccing the off-target until it's his turn for the chopping block and you have a third dynamic to deal with, of course more is always better if you can handle it.
I've found 2-3 is typically the average I can deal with if my gear is meh. I only rarely manage a 1v5 if my gear isn't good or if it's not the beginning of an expansion.
Like I said my gear was 1 year out of date when I did 1v3-5s all day on timeless, most of the people I killed were in gear a tier or two ahead of me. I did like 4 times less damage then I should have, the difference is I knew how to use finesse and control to win. I mean you should have seen videos of my gameplay, it was insane.
Skill>all.
Unfortunately the WoD pruning removed most of the toolset on all classes and thus greatly decreased the skill cap and capability of all classes and the Legion changes were just completely retarded, they put more effort into making sure the new abilities fit the fantasy roll then they did caring about how it affected gameplay.