There are examples of movies where one actor basically carries the weight of the whole picture while all the other actors phone it in for a check. Chipmunks was such a film. As stated, Jason Lee didn't care much for it, so much they had to come up with a lame Marty Sue character to fill the void left in the second one. If Ross and Janice are so lawsuit happy, I don't see why they couldn't sue the studio until they found another actor or something.
You can always tell when an actor is having fun and when it's a paycheck. Jason Lee's performance was angry, wooden, an completely listless. And that's a shame, because his roles in My Name is Earl and the Incredibles you can tell he was having such a blast. I deride the fact they canned MNIE for that lame Parks and Rec series. Though, I will say this... he felt working with CGI pasted chipmunks was beneath him, YET he had no problem with Tom Greene. I call that trading up.
Now, David Cross... not only did he have a character that was more fun to play, he had a LOT of fun playing it. The subplot about getting caught up by the machine of fame and it's dark underbelly was superior than the father son moments for two reasons... firstly, it seemed more genuine and less of a flat cliche done poorly, secondly Jason didn't exactly sell loving father while David was just wonderful as the seemingly innocuous oily producer with a fake smile. By far a good performance can shine in ANY kind of movie, even with a bad script.
But I just want to touch on this for a second.
the only reason Jason Lee accepted the role of Dave was because among those who were offered the role (and turned it down) was his idol, Bill Murray.
I LOVE Bill Murray and all, but really... he doesn't mind putting his name on terrible movies, but he's insanely stubborn when it comes to helping Ghostbusters 3 go anywhere! He's rationalizing his decision to take the lead voice of Garfield by saying he THOUGHT the Cohen brothers wrote it. Bull! Other than the fact that it is a common last name in Hollywood for writers, I think that either A) he was still subconsciously annoyed by the fact that his character was given Garfield's voice in the Ghostbusters animated series or B) it's a easy money recording gig where he doesn't really have to do anything but speak into a mike.
Yeah, that's all well and good, but how do you explain City of Ember?
Seriously, they should have JUST made the animated Ghostbusters movie instead... we'd've actually GOT the thing.