simple, right now why SR >could< be better option than PR/HE? yes, because of rapid fire and his superior attack speed on stuns (double shot and lethal are useless). its already 50/50 when people have RS4, once you add BW sets resist bonus and people having access to 3rd class skills (chant of spirit), stun will be almost non existant except if you are WL who can use quick spear which bypass resist shock. so if stun doesnt land, why go SR? you cannot go dps build on him because with 600-700 range making auto attacks is suicide (considering STR build), and without rapid fire you are better off going with hawkeye which has atk speed passive and dash. now someone would say "hero buffs and debuffs are OP", certainly they are, however take in mind that we are getting hero nerfs from antharas so you can use only 1 hero buff each hour and 1 hero debuff each hour (if i am not mistaken), that means that hero wont be AS OP as it is right now, especially knowing you wont stack lvl 3 mental epics on SR just so you can land 1 good debuff
thats why SR will be sh1t in next patch, right now it has potential of being tanky stunner for archer party (especially if you are hero with CON build, coz hero bow gives like 20% CP/HP, adds 10% additional atk speed and has good base P atk, if you add hero bers to it with static 500 p atk you already have very decent p atk on SR even if you are -str while you have like 17k HP/CP going up to like 20k if you have castle, so you are perfect for tanking and stunning people in front for other PRs)