Deponia is a classic point & click game with every advantage and disadvantage of this.
It has beatiful, hand-painted graphics, ridiculous and unlogical puzzles (making a cup of coffee takes roughly 30 steps, you use car battery acid and black powder from a flare, amongst other things, to make it), great but somewhat simple humour and nice soundtrack. If you are occasional adventure games player, you'll have a hard nut to crack and probably you'll have to use a solution many times. But if you do some task without a help, you'll feel like a pro. And it'll do harm to your analytical thinking skill. So, for that and other things mentioned earlier I think it's worth to play Deponia (other good point & click's too).