The main advantage of force shields is their light weight. This makes them especially popular among wingknights. They are also effective at stopping a wide variety of magical weapons by preventing contact between the weapon and its target. This negates the advantages of melting blades, electrified weapons, vampiric weapons, and many others.
The main drawback of force shields is that they are only effective if there is something on which to exert a force. This makes them completely ineffective against energy attacks, such as negate magic, such as dispelling maces and dispelling arrows. Because of these drawbacks, it is common to see force bubbles used in more indirect ways, such as in field stabilized earthworks.