Correction u r not a nooob u r a newbie...And Hotwire/Tech also can repair faster about twice as fast....Hotwire/Tech can destroy buildings alone, if u put 2 timed c4s and 2 remote c4s on the Master Control Terminal on any building...Engies can't, 'cus they are one c4 short.
And just a pointer...when u r repairing aim at the mct for fastest repair...I've seen new players pointing at the "holes" that appear when the building is damaged...I just ROFL I was a newbie too so I don't mean any disrespect...And when u r laying down mines plz refer to this post:
Laying Mines