Bit-Tech: It'll be a shame if these concerns about the technical quality of the game turn out to be justified too, as Dark Souls is already known to be an interesting and high-quality game on other platforms. It's also a game which cleverly incorporates what would otherwise be definite failings - such as an awkwardly placed and generally unhelpful tutorial sequence - into one of its defining attributes (being nails hard).
Who knows. Maybe there is time for Namco and From to polish the PC version of the game into a reliably acceptable state which makes the most of what the PC offers? Maybe the glitches we encountered were rare and won't ever show up in your playthrough?