Larian Studios Forums Baldur's Gate III Baldur's Gate III - General Are Three Levels Enough for Any CRPG or RPG?

That´s true, but generally speaking low level characters in previous versions of D&D (2e, 3, 3.5...) were less effective. In 5e you get several useful abilities and pick your subclass at levels 1-3 that would add even more.
You do not have a narrow weapon choices, you also add your proficiency to your attack rolls and you add your dex to ranged weapons` damage , so you do not rely on the enchantment of your weapons and could deal steady damage. Low level characters in 5e are pretty strong in comparison so maybe a low-level campaign would not be a problem.