It’s ugly from the outside, but when I looked at some of the interior pictures (the ones on their website, not the wiki site), the interiors are beautiful.
And aren’t we all told that beauty is on the inside?
Yes they are requited by Admiralty laws and by the Coast Guard. Purse, papers, and meds that is all. The boats are launched by gravity davits that require no power to launch. The life rafts are probably Elliots and until the covered boats were a better place to be.
All cruise ships are ugly to me. The whole concept is ugly. That one just makes it obvious.
Classic lines. Classic colors. Looks far less bulky than it probably is.
That other thing is UGLY!
The owner of a shipping company operating ferries between Sweden and Finland was once asked about the newest addition to his fleet: “But can’t you agree that this ship is rather ugly?”
His response was “The beauty of a ship is manifested in the thickness of the owner’s wallet”. 
As for the Oasis of the Seas I really don’t think it looks better or worse than many other passenger ships, but then again I might be immune, living in a town were cruise ships and ferries come and go on a daily basis.
Not all of them.
Holland America’s new line of ships is comparatively puny with “only” 11 decks and a passenger capacity of abou 2100 . Definitely worth a look if you like amenities such as larger staterooms, views, and a high level of service.
They’re not a “family”-oriented line, so you’re not likey to run into hordes of kids.
As for the whole “not tipping over” - It is amazing how ships can stay upright at all. The ship pictured in the above link has a draft of just over seven meters. When I asked about this, the simple answer is that above the water line, the ship is mostly air. Below, it’s completely solid - either fuel or ballast water.
I’ve been on several of the Carnival cruises with my family, both the ‘Princess’ and ‘Carnival’ lines. I really enjoyed them, especially when post-21 and going on the cruise, and being able to drink as much as my own personal budget allows (on the Alaska cruise I was either blotto or hung over for 10 days straight).
If you’re single, its a great way to hook up with people since they really let loose and are ‘on vacation!’ and you get to meet people from all over the country. The dinners were always very nice and you’d get seconds/thirds if you wanted (my favorite moment is my dad asking the waiter if he could get two prime ribs. Sandwiched between a lobster tail “like a sandwich” 
http://www.oasisoftheseas.com/image-gallery.php Check out pic #5 for some perspective on the size of it. Golly gee willickers! ! !
It is ugly, and I wonder about the “feel” of a cruise with such a large passenger list. I’ve never been, but it seems to me that the “cozy-ness” of the limited passenger list would be part of the ambience I was looking for. Hmmmnnn.
You’re comparing it to forms of transportation, when a cruise ship is more like a luxury hotel. (See most of the posts in this thread, which are about the onboard experience, not about the destination.) As hotels go, I expect the Ocean Oasis has an enormous footprint.
ETA: And of course transportation is required to and from the ship, so whatever fuel it burns is in addition to rather than instead of your plane, train, automobile and/or monorail.
Cabrini-Aqua
I can’t imagine what appeal that hideous thing would hold for anyone.
Forgot to respond to the OP. That monstrosity is uglier than I imagined. Docked at a modern industrial port is one thing, but I don’t like to think of seeing that beast squatting in the middle of a scenic ocean view.