Like some others have been saying, I like cover systems in stealth games where you can squeeze up against cover and make sure you aren't seen or you can take your chances and just crouch.
In most games I greatly dislike cover mechanics. I hate running along and then getting glued to cover or not being able to get out of cover instantly when the need arises so I'd much rather just crouch. Being glued to a wall is especially bad when one button does multiple things.
The other thing I hate about many cover mechanics is some games over reliance on chest high walls. You walk into a room and there just happen to be a bunch of chest high walls strewn about without any attempt to make the room feel organic.
In most games I greatly dislike cover mechanics. I hate running along and then getting glued to cover or not being able to get out of cover instantly when the need arises so I'd much rather just crouch. Being glued to a wall is especially bad when one button does multiple things.
The other thing I hate about many cover mechanics is some games over reliance on chest high walls. You walk into a room and there just happen to be a bunch of chest high walls strewn about without any attempt to make the room feel organic.