Not at all. It can easily clean up collector raids, and can easily do successful storage raids if the storages are on one side of the base.
The Barbarians are a line of defense for the archers, and can be used to break walls to get into storages. Deploy them in a line every 2-3 seconds to keep the mortar busy, while the archers are behind them bringing supporting fire. If you keep practicing Barch, it is very good like wh33ls said above.

