For me (1700) the problem is that they often aren't real tactics. One can get a puzzle where there's really no obvious tactical move, only strategic ones. It's

For me (1700) the problem is that they often aren't real tactics. One can get a puzzle where there's really no obvious tactical move, only strategic ones. It's mostly okay, but there's a big difference between puzzles extracted by an algorithm from games, and from hand-picket/crafted tactic puzzles.