RO has a different kind of balance than most if not all games. Regarding skills, Gravity balances out Overpowered ones by making something else even more overpowered.
Besides that, if there's ever a time when RO has been broken is with the introduction of Trans skills (most people agree that the game was better before).
About the DS comment, Stalkers with DS aren't anywhere near as bad as snipers regarding that, so it's not a problem with the specific skill, it's more about the class that uses it. Besides, there's more effective spammable skills when it comes to a sp/damage ratio like Pierce, Grimtooth, Mammomite and Heat for instance.
I agree with your notion of "balance" in RO. Taken straight out of doddler's book i see

;
you are quite right in the sense that it being accessible to a class that can achieve insanely high dex with a bow weapon is what makes it OP.
nevertheless i stand by my convictions because it's a first class skill which can do insane damage (percentage wise) without serious drawbacks (compare it to mammo's zeny cost if you will). And it's range still holds for best reach, and really you need to hide for grim first, so that's already 10 SP down the drain. Heat, as i said before, is SEVERELY LIMITED. Pierce is so size reliant that although you'd probably use it against anubis, DPS wise DS is still better against most medium and small monsters.
add to the fact that mammo, pierce, and GT requires STR, AGI, AND DEX to be useful, and you understand why DS-ers can just get DEX, AGI and INT for more spammability.
hell even with 1 agi it was so easy to level an archer-bard solely on DS with a straight 7x dex then INT build.
again, add to the fact that you can minimize it's SP cost and you get a class with a skill you can use to hunt MOST ANYWHERE for MOST ANY MOB with relative ease because of the HUGE RANGE. Sure hunter/snipers have low carry weight, but they're still not as disadvantaged as rogues imho...
@golden: lol, snipers are ubiquitous and versatile because they have DS, FA (for high def mobs), as well as SS (for groups of monsters). DS remains the fastest, cheapest, most damaging single target skill with the most range.
@Leamee: EDP SB costs way way way more than DS. Again, 12 SP for 380% damage is so cheap and you can further reduce it's SP cost with the sniper acc combo. Furthermore, DS is so spammable compared to SB. And EDP, already being so expensive on its own, also only lasts 60s...
@the ongoing discussion:
i don't WOE nearly enough, but any serious WOE-ers probably know that there are so many ways to circumvent asura and EDP SB by really working together. And them being burst damage is only amplified by the abandonment of the 99 base stat limit, therefore such slanted population job choices are only apparent in higher rates. Play in a decent low/mid rate and you'll see how hunters with DS are THE most populated class because they are the most effective and versatile farming class for most mobs. Sure there will still be champs and sinXes in WOE because loads of RO players seem to be 13 yr olds who like to TROLOLOLOLOLOLOLOLOLOLIOHKOEDYOUTROLOLOLOLOLOL, but again any decent WOE guild knows that asura champs and SBK sinXs are the least of their problems if the occupying forces have a decent precast complete with traps and slow grace + all the status spams like tarot/curse/silence/stun/what ever...
-w-