The thing that let Tales down was the episodic nature which limits the locations and thus leaves less places and items to use on things meaning that the puzzles aren't overly challenging. I think I might have been stumped once throughout the whole of the 5 chapters. Generally the puzzles were pretty easy.
Think about Monkey Island 2 when you're tryin g to find the 4 parts of the map. You have 3 whole islands to explore with plenty of places within each island to explore too. That chapter is HUGE. Tales episodic nature couldn't allow for something like that.