To be fair; SeaWorld is an Aquarium with a couple of rides. Not a Ride park with a few animals. Disney and Universal do not put their focus on animals (though you could argue DAK is; but their original advertising was "notazoo"), seaworld prides itself with the unique product they have to offer that Disney and Universal do not have.
With rides closed, there is still plenty to see and do there! There are 4 main shows (One Ocean, Dolphin Days, Sealion High, Pets Ahoy) that are roughly 25 mins each, plus a 3-d film at turtle trek, plus animals to see in the area (rescued manatees and sea turtles); aquariums with fish to see at the Journey To Atlantis Gift Shop, Manta, and the whole Shark Encounter. You can feed Stingrays, Sealions, and Sharks. Even if the Penguin ride is closed (which is closed on weekdays to cut costs, not weather) you can still go in to see the penguins, Wild Arctic has Beluga's, Seals and Walrus' to see. At Dolphin Cove and Dolphin Nursery you can watch Dolphins play (and opt to meet a dolphin there as well). I started visiting seaworld regularly when there were far less "attractions" (as you call them) only having Wild Arctic, Journey to Atlantis, and Kraken; and with only 3 rides, there was still plenty to see and do. So even if a ride is down for routine maintenance, there's still a lot to do and see! If you're going to SeaWorld just for rides; then you've missed the point of what SeaWorld is.