There can be ridiculous things in game plot. Read: Nintendo.
The thing about horror games is that they're either a hit or miss. Usually the first one you play strikes you the most and the next ones in the series, because you have suspended disbelief the best (I feel the most afraid while playing FEAR while playing Dead Space is a walk in the park for me) with that particular series. Afterwards, every tactic that scared you in whatever the first one was didn't work or was less scary because you could see it coming a mile away.
The thing about horror games is that they're either a hit or miss. Usually the first one you play strikes you the most and the next ones in the series, because you have suspended disbelief the best (I feel the most afraid while playing FEAR while playing Dead Space is a walk in the park for me) with that particular series. Afterwards, every tactic that scared you in whatever the first one was didn't work or was less scary because you could see it coming a mile away.