HAHAHA, I feel ya pain. The frustration, the anger, nearly breaking the controller etc.
It was the most satisfying experience beating them solo, fuck em to death. Its not that the game shows its age here, its that dark souls is actually slow, you'll see the same in DS2 aswell. DS3 took the speed of BB and added it to DS, so its much faster but not as fast as BB.
But because of that, the rest of the game is much easier. It felt cheap to me that it was 2 against 1, but once you know of their lore etc, you appreciate them even more. Watch the Vaati vids after. DS1 is my favourite DS though, how do you like the level design and how everything intertwines much better than the sequels etc?