While I've not seen the ones past O&S, DS1 bosses aren't particularly great anyway. Might be because the combat in the series is a bit limited, but they never felt that fun to fight compared to most action games.

From my limited experience it seems to be better in the later games. Like I imagine the Pursuer to be a fun boss fight, I just can't hit him with the ballista.

But I've seen worse, I've beaten Bloodlines as a melee character. The shooting might be rather bland, but the melee is very old school 'click until die' (and as my disciplines were Celerity, Potence, and Presence...). Fights against mooks are boring but quick, boss fights are just boring.