The actual fight is easy, it's just that first few seconds that can go horribly wrong in an instant.
Yup. I nearly gave up on the game at the Capra Demon for that reason. I would die within seconds of getting past the fog door. The dogs would hit me, stagger me, and Capra would kill be in one hit. Or the dogs would trap me against a wall and then Capra would kill me. Or the camera would get hung up on a wall and then I'd be killed.
To make it 10x worse I was originally taking a bad route to get to him (undead burg fireplace, kill 5 skeleton guys to get down the stairs, past 3 dogs, then past 3 thieves, then past another 3 theives, and 2 more dogs). Every time I died I had to go through ALLLLL of that again.
Taking the Firelink Shrine route through the sewer (reservoir?) was a better route, but still long.
To beat him I spent a good hour or more getting the ring Hervel Ring (so I could wear heavier armor and be weighed down less) AND the Wolf (?) Ring (raised poise so my attacks wouldn't get interrupted). Once I had all that stuff I killed him on the first try. But yeah, once you kill the dogs he's actually a cake walk. It's just a combo of the annoying dogs, the small arena, the long route to get to him, and insufficient loot that made it such a shitty boss encounter.