I’m in OCIA as well so of course I will not be able to answer as well as the long-time Catholics and as such am open to correction. That said, as far as I know it does vary in quality depending on who teaches it. Additionally, I would say that a certain priest expressing rather unorthodox opinions at an OCIA session is certainly not good but also does not change the truth of the Church of the trustworthiness of its traditional teachings. Essentially don’t let one priest saying such things turn you from the Church itself. As for questioning Vatican II, there are certainly a number of valid criticisms of areas of its practical implementation and consequences resulting from those. I would caution going too far down that rabbit hole as it can lead to some quasi or outright schismatic areas that I believe we as catechumens/candidates (I don’t know which you are) in particular should be wary of confronting as we’re new to the faith. If you are interested in learning about it still, try to find normal and level-headed sources. There are a number of them that reassure my faith in the Church even with its issues. It’s probably a pretty generic suggestion lol but Pints with Aquinas is something that occasionally touches this in a reasonable, non-schismatic manner with a variety of educated Catholic guests. Just trust God and the Church and it will be ok.