I started a 5x enhancement shaman team a few days ago. They are 104-105 currently. I originally planned to run 4x enh and 1x blood as my dungeon comp but dropped it for my paladin and DK comp as I think that comp is more viable and easier to do dungeons with. In cata and early mop I ran 4x enhance and 1x blood and had very good success with it in dungeons. I loved the instant cast heals and blanket AoE heals. I think its much the same in its legion state.

My main focus is to have 5 herbalists and alchemists so I can fuel my DKs and paladins potion use and make a lot of gold at the same time. Shamans get the 100% movement speed from ghostwolf with the follower rehgar. You can herb while in ghostwolf form.

I was surprised at how powerful rainfall is. Even at 100 it was much higher than my paladins consecration, despite a 160 ilevel difference. If both healing surge and rainfall scale this well I may have to rethink my composition and try out leading from my paladin or one of my DKs. I'll at least try it out in dungeons. I'll have to run a few dungeons to complete my alchemy quests and order hall quests. I worry that their HP and squishy nature will not work as well in dungeons. Still they have the cherished AoE stun in dungeons on a short CD. I do find myself missing Arcane Torrent and grips I didn't realize how much I relied on them until I played my shaman.

Last night I was able to run Eye of Azahara @ 102 and 103 with nothing but my shamans! I believe lower level toons are a bit stronger because they scale better than a 110 team with lower ilevel gear this early in the expansion.