I like this thread
It's sad what happened to the Simon the Sorcerer series. The first one was great. The second was good but not AS good... everything that came after that was just worse and worse. I find the new ones fairly boring and uninspired.
Syberia 1 was also a great game with a perfect ending and making a sequel to it just took away all of the mystery. Again the 2nd one was still OK but really not needed.
This makes me glad that there are also games like Grim Fandango and (thank GOD) Full Throttle with no sequels that just leave a bad aftertaste. They just stand on their own in perfection.