Currently in 3s, in both US and EU, Sub Rogues and Arms Warriors rank as some of the highest participation above 2800 (a statistically significant cut-off). At the start of the current season though, there was a couple months where all 10 of the top 10 EU teams were War/Ele/Rdruid. In 5.0, Warriors alone had over 36% of Gladiator+ rankings in NA - meaning that on average, every single Gladiator+ comp had a warrior on it - or for every Gladiator+ comp that did not have a warrior - another Gladiator+ 3v3 comp had at least 2 warriors on it. During the same half-season (5.0->5.1), BM hunters had nearly as high representation - which means there were entire gladiator+ comps at that time that consisted solely of some combination of arms warriors and bm hunters (2+1, or 3 of either).
It declined briefly in 5.1 when Stampede was fixed and Taste for Blood was removed - but because of that half-season alone, if you were already at high rating pretty much the entirety of gladiator titles when to warriors and bm hunters that season: it was free glad. In 5.2, we saw two melee do similar things to arena brackets - Blood DKs became the entirety of the 2v2 bracket (almost as bad as s5 Holy/Unholy again), and Thugcleave became the only 3v3 comp worth a damn: with almost as high a representation at warriors/hunters in 5.0.
Now, in the background of 5.1->5.4, Shatreeplay was also a capable comp - but as consistent as it was - and despite that Shatreeplays became the highest rated comps on many battlegroups - it was never the top comp by gladiator+ representation: even when it was OP, it was still overshadowed (by population amongst gladiators) by physical damage comps (KFC / Thugcleaves, etc).
The real takeaway of this is - when Casters think of Hunters, we count them as melee - and when melee think of Hunters - they count them as casters: but Hunters have been kind of broken all expansion.
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Stormblast
Unleash Elements
Frost Shock
Ascendance
Searing Totem
Maelstrom Weapon
Tell me more about all this standing still that Enh has to do to ranged attack - they have more instant ranged attacks than any caster.