The Secret of Monkey Island (Amiga)

The ambition of this game is impressive, and it's incredibly well executed in terms of graphics, witty dialogue, and great music. However, as was the style for Lucasfilm adventure games at the time, the puzzles are nonsensical, making actually playing the game a somewhat frustrating sequence of confusing puzzles. It speaks to just how great the presentation and writing are that the game is still worthwhile.