Come on, we're not nearly as bad as you say we are. Especially not in M+, where we are basically top-tier from a combination of our damage and our utility (even with tyrannical, trash is a huge chunk of the dungeon, and it isn't like we don't do any boss damage).
Yes, we are at the low end, but considering progression is already over at the high end, your spec matters significantly less than your skill/enjoyment. Not to mention, 7.1.5 is coming out extremely soon, so why not play something while looking forward to the buffs?
For reference:
https://www.warcraftlogs.com/ranking...ter/923207/10/ is my character. My group isn't bad, but we aren't anywhere close to a world first guild, and I compete just fine.