The Whispered World
Sadly, one of the weakest p&c games I've ever played. The plot is not interesting, voice acting dull or irritating, puzzles... well, it's either 'borrowed' logic puzzles (cogs, pipes, 8 queen on chessboard etc.) or completely random and idiotic mixing of inventory items and trying them on everything. The graphics... well, that part is gorgeous but that's about the only good thing about the game.
And I think it's worth to mention that I had to take a looong break from this game (more then half a year!). And that's my standard reaction ;) I do it every single time I encounter yet another "get a key from the other side of a door" puzzle. Geez! Just how many time will have to do it again?! Devs! Can't you just stop exploiting this biggest cliché ever?! Grow up already, will ya? Full list