In my opinion xbows are fine and there is no reason to change their statistics. I play as crossbowman and my well made sniper crossbow is deadly. After patch there's a lot of fun because they are much more accurate than before and there is no problem to headshot someone and a lot of people (more than half) are dead after one shot in chest
This won't hold up to anyone with a decent amount of iron flesh and armor. One-shotting level 1-15's is one thing. But as for my character, who is a dedicated Crossbowoman with 150 WPF and using a well-made sniper Xbow with steel bolts, fighting people around my level and doing what you're describing is a bit unrealistic; especially with as many hybrid throwers as there are now. Also, if you don't have at least 130+ WPF in XBOW don't expect to hit anything that's not directly in front of you or a good distance away from you which is probably one of the most frustrating things in the world if you're using a sniper bow. It also doesn't even stand close to throwing right now.
If not a ridiculous distance away(which greatly drops off the damage), i'm lucky if I get two shots off in battle(assuming the enemy won't come directly after me,if they do, it's one shot and then to melee mode or keep running away until they lose interest.) even then, at very close range,a thrower with a decent amount of PT/ items like jarids can match me(if not out do me) in damage. Did I mention that they can jump and throw with a good amount of accuracy as well? Lets also not forget that many of those higher level items such as jarids,throwing lances and throwing spears all get bonuses against shields. Also, the top level throwing item is nearly half the price of the top crossbow. Finally, lets not forget the fact that they can use shields while throwing. Given all of this, I rhetorically ask what on earth makes crossbows seem like a practical or even smart alternative to any semi-serious player? In fact, were it not for the fact that heirlooming the sniper bow brings it close to it's pre-patch stats, i'd probably follow suit and go with throwing. Frankly, i'd be ok with the way bows/crossbows are now if throwing was brought back into check a bit. As they are now, crossbows are impractical in most scenarios unless the player really knows what they are doing, and even then an experienced thrower will usually best them.
I say either show the bow some love, or bring throwing down a bit.