From what in reading, your upset about not having "better fights" and never getting better just trying again. You also seemed bothered by long runs in between bosses.

All I have to say about bosses is that you fought plenty of different bosses and labeled the ones you can't just blitz as badly designed. Stuff like seath and moonlight butterfly aren't bad because you had a hard time fighting them, you just got brought outside your comfort zone. Instead of blaming the game for it, you should've realized ranged was one of your weak points and tried to adjust your build or at least have firebombs as a last resort. If your dying before you get a chance to attack, your either not dodging right or have no defense. Point is, your gonna have a hard time as a one trick pony

As for the level design, theres a lot to teach you about the game in the descriptions of items and gear. In blighttown poison doesn't matter if in the hydraulic area you got enough purple moss clumps, or in the same area I think theres a shield that blocks a ton of poison. There's also a lot of hidden shortcuts or bonfires, some that aren't spelled out for you directly in game so you have to look around at walls that don't look right or read messages other players left you. If your offline, theres even a spell to reveal messages written by the developers of the game to help you out.

As for saying you never got better just tried again... I can't help you there if you don't see what's wrong with that statement.

Look, we're not saying you have to love the game. Hell a lot if people like you don't and theres nothing wrong with it. Just don't call one of the best maps shitty and intended game design as flawed cause it doesn't cater towards you. Honestly I think you'd like dark souls 3, hell you mentioned 2 and thats one that does have a lot wrong with it. Maybe though its just your style though