Tier list!

[Holicccc]

Drg should be s tier. Drg is basically the perfect melee class for pvp, they have two gap closers one being a stun, borderline retarded burst, elusive jump removes heavy and bind.

[Cynric]

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Dragoon does have heavy early burst, however once their cooldowns are spent if no one died they need a bit of time to set that burst back up.

However unlike Monk, their gap closers are on a 1 minute and 2 minute cooldown as opposed to a 30 seconds CD. Elusive Jump is great but only usable once every 3 minutes, that's a hefty CD for you to just be bound a second time, then slept. They also lack utility outside of damage buffs, however their CC does match up with Monk. Their full burst however takes much longer to come back then Monk does , about 2 minutes versus just 1 minute.

Their damage utility is also able to be dealt with via dispel.
However despite the fact that they lack utility, they do have great self healing, amazing burst, a free get out of bind every 3 minutes(usable maybe twice in a match), a stun and heavy, CC immunity in fetter ward. Drgs are really great early and late game. They just aren't quite S-Tier material due to a lack of utility outside of damage buffs.

Dragoon does one thing really well and that's kill someone extremely quickly , and it does that so well it's definitely A-Tier. But it doesn't bring much else outside of damage. If you let a Dragoon snowball yeah it'll destroy you. But after the initial attempt to snowball a dragoon needs to wait quite a bit before they can make you sweat again.

Maybe they're close to the borderline, if they had more utility like monk does I could see them being S-Tier, however they just don't have that utility as of this patch.

[RiceisNice]

Dragoon does have heavy early burst, however once their cooldowns are spent if no one died they need a bit of time to set that burst back up.

This is the case for any dps. The difference is that DRG's dps outside of their burst is a bit of a step up from what ranged can do, on top of the relatively stronger durability and self healing. However I still wouldn't count them to be above MNK due to the recent nerfs, that their DPS can overshadow what DRG can do, and mantra being so incredibly powerful with a scholar/nocturnal astro team.

[Cynric]

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Yeah I'd agree with you here, also Monk only needs about 40 seconds now for enough burst to take squishier jobs down. Forbidden Chakra + Somersault + Elixir Field + Tornado Kick + Mercy stroke inside GL3 with Twin snakes active and DK on target is enough to kill every 40 seconds. Then Howling Fist becomes available every minute to enhance burst if you feel it's needed. Monk can also counter Dragoon itself by dispelling their damage buffs. Forbidden Chakra is only limited by the player.

Monks sustain is nothing to laugh at either during the relatively short windows between burst in comparison to Dragoons. They have a shorter CD on their gap closer, As you already mentioned the traited mantra is an extreme boon to any team. Then there's the spell speed reduction utility of somersault in combination with the slow from feint. The shorter CD of somersault makes it easy to now Arm of the destroyer a healer mid heal to silence and prevent them from healing while you burst them.

The three stances Earth,Fire,and Wind increasing survival, burst potential, and chase/harass potential permanently till removed via dispel(easily reapplied) or changed out for another stance. Dragon Kick debuffs caster damage.

Even while binded a monk can build chakra for burst, switch forms to prepare to keep GL.

On top of everything Monk also has access to fetter ward and an AoE pacification(10 seconds) and instant GL3 for another quick burst or to save a healer or team mate.

Dragoon is good. Monk is ridiculous, in terms of utility, CC ,mobility, debuffing potential, burst, sustain, harass, Monk just has it all.

I think Dragoon is great it's a good job, honestly very balanced, it's not too bad and not too good. and has very little utility. Monk however is extremely borderline in the amount of options, utility, and damage it brings.

This is why Dragoon is an A and Monk is an S.