sometimes the better way to win is to avoid the meta game.
by knowing what you fight you can actually know how to react, and you have to not consider only yourself, you have to consider your friend as well.
back in TBC before 2.4 i was a disp priest playing 2v2 with a hunter friend.
we were not winning any fights even with all the mana drain we were doing, until i switched spec to be more utilities then healing. first off i was 39/11/11 back then holy nova was in the holy tree and i needed mind flay as well. back then we could use holy nova rank 1 for like 100 mana to find stealthed opponents before they could do anything.
the why it was a good spec was that my friend had difficulties keeping his opponents from reaching them. so holy nova fixed my rogue and druid problems by finding them, and my mind flay actually slowed the opponents down so my friend could DPS them without having to lose time on getting back. that spec was brutalised back then because it lacked pain suppression which was the best of all priest healers in arena, but to me we have gotten from 0-10 to a good 5-5 between me and him. our rating actually had gone up and we fared quite good against teams we were sure to lose to.
all this to say the same as i started, the goal is to go beyond the meta game.
dont play like others, you'll have the advantage over them if you do.
that maybe why i like weird combos and think they are funnier to play.