I finished two adventure games recently: King's Quest I and the Wallace & Gromit Grand Adventures demo.
First, King's Quest: I liked it, but even for a Sierra game the logic for the puzzles were weird.
But, it was one of their first adventure games, so it's understandable.
The storyline was very simple, but nice. But the ending was a little sad. I felt great that Sir Graham got his reward, but the last animation was disturbing, and made the ending really feel semi-sweet and borderline depressing to me.
As for Wallace & Gromit's Grand Adventures, I really enjoyed it a lot. What was there captured the look and feel of the movies, and the references to their previous adventures were fun.
The control worked a lot better than I thought it would. It's miles better than the direct control in Grim Fandango and Escape From Monkey Island. I can't wait for the full game.