Ya, accuracy sucked. It probably wouldn't have been so bad if SE had have bothered to update healer gear with more built in acc each tier, but they didn't =/
As a system it probably could have been made to work with some time and tuning though. Ensuring that your next cast always hit after a miss would have done wonders for making it a less frustrating system for example. Back to back dot misses on Living Liquid were hugely irritating.
Perhaps even adding it as a combo stat alongside piety would have been an option to explore if it was still around today.