I actually very rarely do 2 mcv on rift as Nod - the reason I went 2 MCV that game was that I scouted your base and saw you moving MCV down to the spikes - I noticed that you had gone 2 ref before WF for some mysterious reason (which then made a lot of sense after the game ) which delayed your harv production so I figured that I could exploit this by going 2 MCV without building any units to defend because by the time you build the standard 3 harvs before units (42 seconds) I could get my MCV out for free (35 seconds) and have plenty of time to defend any pitbull pressure with scorps while getting my tech/eco up.
Obviously there was something big that I had missed, which made the game very fun to play in the end
I decided to try something else...