And what if you're in it for the story? Puzzles are well and good, but once the puzzles are solved, what keeps me coming back is a solid story. Right now, we have a real page-turner; ancient mysteries, a family in danger, a distraught patriarch, a long mythology coming back to haunt the family...
Even on the classic KQ games, the puzzles and amount of them didn't hold as much attention as the story. The puzzles were just things I had to solve in order to access more story. Ditto with Bioware games - you fight, you fetch, you might get a decent puzzle, but the star attraction is the beautifully-rendered world, the intriguing characters, a well-written and clever line of dialogue.
Your mileage may vary.