Okay, first off, stick to one point, i acknowledged above that Resto Shaman is in fact bad for RBG, so there's that, but suddenly you also throw M+ into mix.
I get it, Shaman sucks in a lot of areas currently, but this doesn't make the discussion any easier.
Regarding those statistics, simply taking two classes and throwing them into one pot is not a good thing, especially as the strength of Disc and Rogue doesn't neccessarily mean Shaman needs to be buffed, it means Disc and Rogue are too strong.
If you actually look at the statistics for 3v3 above 2,2k, you see that Shaman isn't doing that bad.
https://www.worldofwargraphs.com/pvp...v3/2200-rating
Resto Shaman is the 2nd best healer behind disc, Enhancement is also still on the Top 10.
So yeah, if you're up for 3v3 as Shaman, you should find mates, there are viable comps to play as Shaman.
Does this excuse the rest? No it doesn't, but that's another story.