No there's certainly other differences --Mary, the Eucharist, etc.. Just going with the one you mention ("the worship of Mary"), the two sides sometimes seem to be speaking past each other. Catholic/Orthodox doctrine holds that one should venerate Mary, but not worship. Protestants perceive it as worship, but Catholics perceive it as veneration.

But the bigger question that looms is: what is our criteria for what counts as scriptural and what is not scriptural?

There doesn't seem to be a simple answer to that sort of question.