The shark is practically a small Megalodon.
It's obvious they came up with more ridiculous ideas as the films went on.
The first thrived solely off character development and suspense whereas the second was just a slasher film with a shark killing several people simply because it wants to, not to eat.
Then for Jaws 3 they tried to make it really interesting, setting it in a sea world park with a ridiculously monstrous shark that could almost be considered Megalodon status. I don't know if that was supposed to be scary it more so comes off as a B movie monster to be honest.
I remember as a kid Jaws 3 was my favorite because it had a big monster shark haha, I think that came from my love of Godzilla. You'd never see a shark like that in your lifetime, no one would.
The one thing I can say however is there was one scene in which the shark's size was actually effective..the scene when the guy is completely engulfed by the shark I just found to be terrifying in a way. Not really when he's in the sharks mouth but before he goes in the sharks mouth. He's just cornered in this tunnel and the shark is way too big for him to swim around it and he knows he's just screwed. That scene is just so claustrophobic and that's when the shark's monstrous size was actually effective that it made the scene somewhat unsettling to me.
That was the one scene in the entire movie that actually legitimately scared me when I was young, and it still unsettles me now despite what a terrible movie it is. So I can give it credit for that, they wouldn't have been able to have a scene like that without a big scary shark.
Only people with money say that money doesn't matter.