Most of the matches are not shoutouts unless there is a huge skill&teamwork difirence or are pugstomping. For relative beginners, aside from REBUILDING with mallet you were going well.
Mallet = most efficient at repair
Spanner = best at repair
Wrench = best jack of primary enginering duties, master of none (ie. balance between repair and rebuild, should only use it when you can't take both mallet and spanner).