Ranger interrupt is bad generally. the trap is a minute cooldown and has to be thrown, Ranger needs at least 15 meters minimum for there damage orbs and 30 meters for some of the talents (I use the 30 meter talent so will always be far away). Mobs interrupt roughly every 20 - 30 seconds? (as a guess) so the trap isn’t a viable option even if you can throw and aim it like a god (its extremely hard to do plus the trap has other issues enough that people forget it even exists).
The charged shot is the more viable option but still sucks for an interrupt. it takes 2 seconds to charge without fast charge talent, with the talent it takes 1 second. It then has roughly an 8 second cooldown and is one of the main sources of damage for a ranger - it adds a debuff to mobs that increases all players damage to it by 5% and if hit into a ‘weak spot’ counts as 2 weak spot hits. So to use a charged shot purely for the interrupt on mobs is a lot of damage loss (as mobs seem to take reduced damage/no damage when they need to be interrupted).
Taking into consideration tiles that most rangers use, the charged shot is used with the piercing arrow so interrupting either losses your tiles that rotation or makes the charged piercing become wasted when shot into say a link shield interrupt. Also (from my experience) once your slightly off rotation its extremely hard to get back without skipping at least a second rotation.
That last paragraph is only true if your charged shot is actually up for the interrupt as generally you want to use it asap or your wasting DPS and with the roughly 8 second cool down its easy to not be able to use it the whole time the interrupt bar is there.
Sorry for the slightly rambly post but as a ranger main its an annoyance for me that ranger is the only class that can’t reliably interrupt on demand.