Yeah, bugs were Origins' major downfall. I got the game somewhat late, and after it had been patched, but even then there were still a couple persistent bugs (although none that were truly game-breaking).
Honestly, if they were to fix those (which they've explicitly said they won't), I would feel comfortable calling Origins the best game in the series; the gameplay's a natural evolution of the previous games, and I honestly liked the story better than Asylum or City's (not to say I didn't like those stories too, but I felt Origins' hung together better).