As a mainline Protestant who is raising his kids as Catholic because of all the problems in the protestant churches, I have seen both sides of this debate:
On the bad side, the Catholics have some really odd ideas on Mary. Literally they are trying to make her a co-redeemer, which is blasphemy. They cover it a lot of fancy words, but the reality is they have statements to the fact you look to Mary to get to Jesus, which is really a false teaching and quite dangerous as to misleading folks to where their salvation lies. (hint; it isn’t Mary)
On the other hand the Catholics have not gone down the path of inviting each and every pervert into the church, under a new doctrine discovered in the last 20 years about tolerance. So the Lutherans, Episcopalians, Anglicans have some ideas that are equally off and in fact very dangerous.
Now The Methodists and most remaining protestant churches have all allowed in female preachers and they have changed the doctrine of male headship. Most of these mainline churches are frankly pussy-whipped and not worth going into, they teach some kind of feminist crap for the most part. The Presbyterians for example had their women folks erect a stature of the goddess Sophia back at a women’s conference in 1989, something they have not lived down to this day. So they also have false doctrine.
So you are left with various sects that are into once saved always saved with the implication we lose our own free will once converted.....too chicken to deal with that one here, but folks who have studied this will have their own conclusions. There are also ideas such predestination, the 180 year old doctrine of rapture, handling snakes for fun and profit, absolute pacifists and a whole host of doctrines folks can argue about. Likely a lot of these ideas are right to some extent, but pushed to the extreme become false teachings. Which is what the Maryism of the Catholic church is. They are not alone in some false ideas.
In the end each and every church today has major flaws. Fact is we all likely have errors in out belief, the more we study things, we cannot help it, we are flawed humans. I suppose that is good in a way. If one church was perfect we would worship the institution, rather than G-d.
One person’s view, which could be very off. I am sure it is in some manner. I expect to be surprised about a lot of things when I die. Hopefully I get a few things right, which in the end is all that matters (I hope but I may be wrong).
Maybe you don’t know this but the Roman Catholic church makes belief in the Marian dogmas (her sinlessness, her perpetual virginity and her bodily assumption into heaven) mandatory. Are you sure you want your kids coming home and telling you you’re going to hell because you don’t believe it?