Shadow of Yharnam is (are?) down...
two tries.
Current score, asterisks are for when I only count my first time fighting them in case I fought them on multiple playthroughs:
Cleric Beast - 2* tries
Father Cascoigne - 1*
Blood-Starved Beast - 2*
Vicar Amelia - 2
Witches of Hemwick - 2
Darkbeast Paarl - 2
Shadow of Yharnam - 2
I am happy I am doing good, but it is kind of disappointing as well. I miss the feeling of satisfaction the bosses in Dark Souls 3 gave me when I finally overcame them.
I'm a Soulsborne newbie, so I was pleased with how I did, but not as well as you.
Number of attempts needed on those bosses -
Cleric Beast - 2
Father G - 4
Blood Starved Beast - ~12
Vicar Amelia - 2
Witches - 3 (embarrassed, just carelessness, not difficulty)
Paarl - 1
Shadow - 1
Next Boss after Shadow - ~8-9
So it was a bit more variable for me. After the boss at Bergenwerth though I did do at least 3-4 other bosses in the main game in a single attempt, possibly a little overpowered.
Let's see how you do on the next boss. She's difficult for a lot of players and a bit different. BSB was my first wall and the next boss you are likely to encounter was my next with probably 8-9 attempts needed.
One thing that is weird is that on several bosses in the game where it took me >5 attempts, I very nearly beat them on the first or second try and then got into a rut and it took a long time to beat them. This happened for
BSB, Rom, Laurence in the DLC
If you find the boss difficulty not enough though, the DLC should help. Its an epic run of 5 bosses that elevate the BB experience.