... maybe you're letting your Shatner hate distort the facts?
Rubbish! I don't hate William Shatner. I love Shatner in TOS. His hammy delivery and campy action style, like jumping up in the air and kicking someone, for example, worked perfectly with the kind of fun show that it was.
By this time, though, he did dip into the STAR TREK well once too often, by appearing in GENERATIONS. And by doing so, managed to steal my joy of TNG's motion picture début!
... Thief! THIEF!!! Stealing My Joy is his only crime. Well, that and his acting, in general - but especially, at The End. And he did much
more than simply "sign on" to this project, as he was "above" the script that was initially handed to him. Indeed, he became a very large part of the creative processess that shaped the storyline of GENERATIONS.