You forgot about the ancient evil part.

Suddenly, as the Interceptor II reaches halfway to the edge of the galaxy, it stops. It finds itself grabbed by a giant black tentacle, appearing through a hole in space. A giant electric shock runs through the tentacle into the Interceptor II. The Interceptor II takes 50000 damage!

The tentacle is one of the limbs of this ancient evil monster. The monster can create new limbs at will, and the limbs are powerful enough to snatch a high-powered spacecraft and stop it mid-flight, and crush it without much effort. The evil being itself lives in subspace and cannot be hurt by normal weapons. See why the wars are all one-sided?