I might not be expressing myself well but I'm not new to these games. I've explored the majority of the game and, to my knowledge, have done all the major bosses up to the end. I know what rune arcs are. I'm going in fully prepared at SL 170.
The issue is that the bosses have lost that feeling of fairness and enjoyability. Malenia took me 3 hours which is nothing compared to how long it took me on a boss like Orphan of Kos. Yet, I managed to enjoy Orphan and felt soooo good when I took it down. Malenia? Almost caused me to quit the game and I will not be doing her on consecutive playthroughs (assuming I even play the game again).
Maybe I've changed? I've become less patient as I've aged? I don't know, but something has changed and I appear not to be the only one.