warships do not sink easily. Perhaps that is modeled. I would think a Maverick wouldn't be a kill shot for something that has water-tight compartments and damage control. Assuming that is taken into account.
Watch any video of a SINK-EX and you will see warships with no damage control parties and likely all water-tight compartments prepared- they tend to take multiple bomb and missile hits and a torpedo to finally send them below.
The USS Cole was hammered by a suicide boat in 2000 which was signifigantly more powerful than a puny Maverick warhead and it still stayed afloat.