I haven't ever sailed on one, so have no idea, but from the design reviews I was on the concept seemed reasonable for the plant load. The hard part of that is whether or not you get anywhere near it in actual operation, especially when you have major demands like the upper deck heating elements that won't be used at all for most of the actual sailing they are doing, but seem important for in the Arctic (and guess Antarctic). With all the diesel issues they have had, probably take a while of them operating properly to figure out if it actually delivered.
That's the issue the CPFs ran into on the DG load calcs; the actual routine sailing load was higher than one diesel was sized for because of some extra pumps got added on during the design when they ran out of cooling capacity, but way too low for two DGs. But the system was designed so that two DGs could handle the full combat load, including with a full dump from 0 to 100% with a pretty demanding max frequency droop, so the actual engines were oversized for that as well. I can't remember the actual figure, but the actual engines were rated for around 20% more than the generator end, so even in decoking runs the engines themselves weren't running at 100% (but the generator end was).
You get some weird compromises for diesels with combat requirements, but the modern engines are much better at lower loads, and there was some rationalization on the requirements to carry a load dump, so the replacement Cats are a pretty evenly matched DG set. Poking around on the CPFs 30 years in revealed a lot of things in the design intent that were completely different than 'as delivered', so a big LL for CSC was to make sure all the compromises done during design spiral get documented and key things like design intent for the ship reflects the 'as delivered', not the 2015 wishlist.
Anyway, for some kind of diesel-electric plant with combatant requirements, I think you can build in more flexibility and have a few different sized generators to better match the different load situations because you get a lot more variance with also supplying propulsion. A few bigger propulsion DGs and some smaller auxiliary DGs makes a lot more sense, and can still build in some redundancy for combat survivability without going too crazy. MCDVs had no real weapon systems, so 4 identical DAs worked well generally, so the issues were more around the choice of diesels and some other weird design decisions (like salt water coolers in switchboards).
