Bloodsucker and Poltergeist in the prologue are a bad design choice

Does anybody else think it was a really bad design choice having both a bloodsucker and a poltergeist in the prologue?

I'm 30 hours into the game now and I love it (despite the bugs) but I very nearly quit right after the prologue.

I think it was a terrible design decision to have a semi invisible enemy and a totally invisible enemy (if you don't know what to look for) at the very start of the game without so much as a hint to the fact that invisible enemies are even a thing.

Having no experience of the prior games I genuinely thought the poltergeist was a bug, I had wrongly assumed it was another blood sucker but the game had glitched preventing me from seeing what was attacking me.

It really needed some explanation from an NPC or a radio call to explain things... hell even a document to explain it, just something, anything.

There was also very little combat prior to these guys, so you can't even get used to combat before you're facing invisible enemies.

I do love this game now, it feels like the Dark Souls of the FPS open world genre and the sense of discovery is fantastic.

I'm all for opening a game with "trial by fire" but invisible enemies aren't a great way to introduce things.