I popped my engineer in the MFDC and love it. It's a great ship layout for a heal/tank eng. captain. I had originally tried it with a science officer and didn't feel I adequately used the ship (that captain now swaps between the Vo'Quv and Kar'Fi carriers). I like not always flying escorts or BoPs in STFs, and this ship lets me keep folks from dying to Tac Cubes or whatever and tank Borg all around space. Decent DPS is definitely possible, as well (though not as much debuffing fun as a Kar'Fi).
I know Kar'Fi can be slotted with a good eng. drain build, but I think that ship shines much more with a tac or science officer.
The Vo'Quv will net you more hangar fun, but I felt the Marauder's boff layout was far superior for a healing role.