While I wasn't there for most of it, from what I heard, read, and sort of played, the Commando made the old vetted Obers look like Conscripts back in Alpha.
It was their bloody ambush ability that made them monsters. But I am sure Relic fixed that, coz otherwise they would be so OP. I usually don't say units are OP, except for LMG Obers, but if they keep the same stats it would be a disaster