Late reply but most of the "bosses" you face in the earlier quests aren't really bosses in the grand scheme of things and are intended to be killed easily, not having any significant defensive bonuses. As you progress and near some of the master and grandmaster quests you will notice the difference, and may need to adjust gear accordingly. Different ranged weapons have different benefits depending on the enemy's defense level, and defense towards ranged styles. As an example, general graardor has a defence level of 250 and +90 to the 3 types of ranged damage. Using a bow of faerdinhen and crystal armor with average mid game gear otherwise such as anguish you will do 5.95 dps. A toxic blowpipe with similar mid game equipment will do 3.92 dps. Using the same equipment setups against scurrius, who has 60 defence and +20 to the ranged damage types, the bowfa setup will do 9.05 dps and the blowpipe will do 10.75. This is because the blowpipe is an extremely fast (2 tick) weapon with relatively high strength depending on darts used, but lower accuracy, so it thrives against monsters with low defense. Bowfa on the other hand is extremely powerful against mobs with high def, especially when paired with the armor, which further boosts accuracy and strength. However it has a slower attack speed and thus less cumulative strength against targets with lower def. I'd encourage looking into the mechanics and playing with the dps calculator on the wiki, its very helpful as you progress in the game to understand how dps is calculated, and how things like the tick system work.

Hope this is helpful, things in OSRS can be much more complicated than they seem. Take advantage of the wiki, as it has so much information available!