SCARABS ARE BS

Check out this thread --> https://answers.ea.com/t5/Game-Information/gt-IF-YOU-ARE-HAVING-TROUBLE-WITH-SCARABS-CLICK-HERE-lt/m-p/7208069#M2168

They're fairly easy.  And, really, once you embrace how easy they are you'll start being thankful when you see them.  It usually leads to an easy win since you can destroy so much early tib that your opponent threw at you.

I have seen a few fights where they are used well.  Protecting you're own Harvester or later stage as mobile mines for expensive units - forcing your opponent to pivot.