That's a bit of a simplification. While hydrogen bonds are weaker than covalent or ionic bonds, they are not necessarily weak in an absolute sense. Here's why:

* Stronger than Van der Waals forces: Hydrogen bonds are much stronger than other intermolecular forces like van der Waals forces. This strength is what allows water to be liquid at room temperature and for DNA to form its double helix structure.

* Crucial for biological systems: Hydrogen bonding plays a critical role in many biological processes. It holds DNA strands together, stabilizes protein structures, and allows water to dissolve many molecules.

So, while hydrogen bonds are weaker than the bonds that hold atoms together within a molecule, they are still significant forces that influence the properties of many substances, particularly biological ones.