What OP said:
Ranged dps atm are nothing but timers.
Brd: Gotta keep eye on all your CD's to get the benefits stacked on DoT's and gotta keep DoT's up 100% of the time gotta remember Straight Shot buff all the time.
Mch: Reload, Quick reload, Wildfire, DoT, Hot Shot, Turret has to be in range all the time you're dpsing.
If you don't pay attention on your wildfire rotation, or when to save reload/hypercharge etc for wildire, or other CD's.Blm:
Don't even tell me enochian rotation is easy while maximizing dps during movement(2 timers to be able to do your basic rotation, 1 DoT, many CD's for optimal dps)
Smn: If you don't get your stacks used correctly, or you fail your dreadwyrm rotation, it's quite some dps lost right there. Not to mention the amount of DoTs you have, and the amount of dps your DoTs gives you. And please don't let the pet die.
Now then, back to mnk and how it's so hard.
While writing this, I did few different imperfect rotations:
Rotation where I'm doing the coerul forms: demo, snap, snap, demo, snap, snap, demo and leaving out ToD while spamming all the CD's when they're ready gave me 1050 dps (I'm i179 with ilvl 180 weapon mind you)
Rotation where I did demo, snap, demo, snap and sometimes let ToD fall off, sometimes kept it up yielded same dps.
And when I'm doing everything by the book. 1190 ish dps.
(Using the opener you posted on all of them)
140dps difference.
The only time I could get the difference to be more than 200 was when I did all the positionals on the wrong position.(with spamming CD's, leaving out ToD, doing opener on wrong positionals too)
920dps
I know for a fact that if you don't do your wildfire perfectly as a mch, your dps will drop by 200-400 depending how badly you did your opener (which is far more complicated than monk's)
As for bard, I did a run with just dots + straightshot + heavy shot + Iron Jaws to keep them up, 600 dps at 2min. no opener, no oGCD's etc, just those 5 skills. (Didn't want to do all the openers and CD managements and what not cause it'd take so much more time)
Then I did a run with dropping DoTs 4 times in that 2min (There's really not that much more time you can drop them and keep them alteast for the application + 1x Iron Jaw.) 560 dps.
And a run with no DoTs at all 450 dps.
You can read up 'bout blm's potency loss when you can't use Fire IV + enochian. That's even worse than mch's poor wildfire management. (Fire I 180 potency vs Five IV 280 potency + 5% dmg boost from enochian.)
And then Summoner. Your main dmg comes from dots, as you know, but if you just spam your dot skills you're getting even worse of a dps loss than blm would with using 2.x rotation (cuse of failed enochian), because you have no initial potency on your DoT skills, other than miasma (20 potency), but if you forget to reapply the dots while doing dreadwyrm stance ruin III spam, or just normal ruin spam, 135 potency per 3 seconds if you don't have any dot or shadowflare up, thankfully your pet will dps all the time it's alive.
So yeah, easiest dps class out of ranged vs mnk is monk, if you want to get efficient dps with close to no thinkin (1-2-3 rear, shift + 1-2-3 flank and spam all your CD's)
/3619 char
Edit: Oh right, nearly forgot the "melee has to dodge more" (can be found on first quote I posted in this post)
Currently I feel like I have to dodge more stuff/dodging affects my dps as a ranged class more cause all the ranged classes has cast times now, and there is close to no AoE's that'd be a circle around the boss, exception being the 2nd boss in Fractal Continuum. (In non raid environment, as the OP said he/she's not too much into raiding in many posts)