Ah, That '70s Show … It was one of my favourite TV shows during my high school years, but I began to like the main cast of characters less and less throughout the last three seasons; maybe it was just me, but everyone seemed to be turning into wholly unlikeable assholes (except for Red, of course; he remained awesome throughout the entire run of the series). Also, I hated it when Donna went blonde.
I really need to rewatch the show myself, though; I have fond memories of the early seasons, particularily the first season.
You’re right, when Donna went blonde was a turning point in the series. I enjoyed the whole show though, except for 95% of season 8. They should’ve just ended it after Foreman and Kelso left the show.