[Dwagginz]

Personally, I prefer puzzles that are well constructed rather than being complex/hard.

I found Dreamfall's underground maze to be an example of a poor puzzle, with Keepsake having some potentially good puzzles that were let down by being implemented poorly or in a very lethargic manner (Pull a lever, cutscene, pull a lever, cutscene, push a button, cutscene - Yawn).

I quite liked the one in Broken Sword: Shadow of the Templars - Director's Cut which had you decrypting messages. I thought that was a well constructed puzzle that, whilst not easy nor hard, was long enough and involved you without being an overbearing or poorly designed problem to solve.