Fair enough, the user-friendlieness is definetly a thing. DS 1 basically just threw you into the pit and then walked off to get popcorn. I think the last giant is a very decent big baddie for new players to meet. He is intimidating, and does quite a lot of damage, but has a strict pattern and easy flaws to abuse. Its not THAT far off the Asylum Demon, at least for me. The Asylum Demon was a wtf-moment because it hit you so early. I mean, he's laughably easy once you get close too, it's the initial shock that makes it memorable. (That, and the fact that some people try to kill him with the hilt, lol.)
Im a bit torn, again, I think a lot of the difficulty spikes and lows hail from the variety of builds avaible. It's noticeable when you ask people which Bosses annoyed them, and which just came off as easy. The only Bosses where I hear people consistently moan are the Sentinels (If you're unlucky, its 3 on 1. No wonder that so many people hate it. I eventually 3 manned it when I was tired of getting blindsided.), the Smelter Demon and a one I havent seen yet (And im not gonna spoil myself anything beyond the name, which I stumbled upon accidentally, not that Spoilers bother me that much.).
And tbh, I have no idea how to improve the system, or if it even needs improving. You could probably add some more patterns to the Bosses, have them react to certain playstyles (The Giant for example could've tried to hinder you from just rolling between his Legs all the time. Or the Pursuer actively smashing Ballistae once you fire them.). I do think some of them have too many loopholes, or one big glaring one. Capra Asshole hat nothing beyond the fact that you could kite him on the stairs for a bit (And that doesnt help with the Dogs), and I was a bit dissapointed til now that there doesnt seem to be a Boss that comes at you so aggressively as, for example, Sir Artorias.
Stuff like that would probably consume a lot of time and planned content tough, which could ultimately lead to less areas and Bosses. And truth be told, I'd rather have a Boss or two I can transform into meat piles without a sweat and a lot of additional content, than 5 Capra Demons in 3 Areas.
PS, as everyone mentiones Capra Dude as a prim example of DS 1 being difficult. I think from all the serious Bosses in the game, he was the cheapest. It wasnt even him, it was those goddamn Dogs, and often came down to "Who stunlocks the other moron first.". Personally, I'd mention Guys like Artorias, Manus, Ornstein and Smough, Queelag or the like, because those really felt like my Skill was tested, not my capability of pimpslapping op Dog-Enemies led around by a giant goat.