You guys forget Intrepid is Fighting Starship, it's Galaxy equivalent at the least in Firepower. Janeway litterally informs one Borg ship that Voyager can match their firepower and it was no idol threat. Voyager disable their shields in two hits..
That was a tiny scout ship, not a Cube.
Plus I think the Intrepid is itself a scout ship and/or science vessel more than anything.