Way I see it (and this is why I ended up disliking BS), the problem isn't that it's a shooter, and that it lacks deep RPG elements. I wasn't expecting those. Expecting such things in the world of today, in a mainstream title? You have to be delusional. Sure, those do crop up occasionally, but expecting one? Nah.
Problem is, it sets things up and never follows on them. It sets up a microcosm, and when you are in it, it's dead. You just got yourself a beautiful aquarium full of fish corpses, bub. Awesome, ainnit? All this pseudophilosophical stuff, what is it good for when there's one person monologuing it to you? What is all this nonsense about transcendence, when you're governed by a magic word? What's the fucking point? It's not even a trainwreck, those at least keep your eyes locked on it, this is someone falling off a ladder. Little Sisters, what's the point, when in the end what you do with them amounts to HYPERBAD ending and HYPERBLAND ending?
Basically, it's all setup without payoff, and the only actual thing that's close to one is a one premature climaxing that could basically end the game. After Ryan's death, the game turns to predictable shit and a boring half-QTE endvillain, as well as forced timed sections, limited sections and an escort mission. This is fucking endgame, the player should be ripping shit, facing stronger enemies and ripping them apart as well, what the fuck am I looking at, why was I stronger at 4th level than I'm at 2nd to last? Who made this shit up? FUCK! Escorting NPC? FUCK YOU GAME.
Edit: Also, I thought becoming a Big Daddy was an irreversible process, and that suit weighs a ton, how am I moving in it? Hello, a little consistency would be nice?