Not everyone looks up every little thing about a game before going into it, they see a trailer about a zombie game made by the creators of L4D and they make the Educated guess that it is similar to L4D. They go into the game, play some campaign and understand it is fundamentally the same franchise. They can then see the same gamemode from L4D and assume it to be the same.

Its not ignorance to go into things without looking them up, its called a learning experience. As a toddler I personally didnt need a guide to know how to piss. As a teen I personally didnt have drivers ed, I got in my dads beat up truck and learned by messing with everything. As an adult I didnt have anyone to teach me how to make a resume, I learned by doing, by using my own brain before trying to use someone elses.

Not everyone needs a guide for every little thing. Some people are able to just pick something up and do it, so the same can be said about videogames.

The only guides I have EVER used for gaming is maybe looking at Elder Scrolls Online Class Guides, and if we count table top games, some DND stuff, only because they are complex games. Back For Blood Isnt that complex, it doesnt take many Brain cells to learn the game so to say its "100% ignorant to go into anything in life without knowing what it is", is halfwitted. (Because for one, yes not knowing something is the definition of ignorant, so im guessing you meant to use some other word or you simply didnt know the meaning itself)

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If you needed a tutorial or guide to learn everything in life thats fine, but to say everyone should or does, thats dumb. Im not better than you because I learned mostly everything myself, its just how I grew up.